1.3 Space craft helps us explore beyond Earth
Orbiting Earth
After 1991, the Russian space agency and
NASA began to act as partners.
*The first space station (a satellite in which people can live and work for long periods) was launched in the early 1970s.
*Russian and U.S. astronauts carried out joint missions aboard Mir, the Russian space station . The Mir missions helped prepare for the ISS which began in 1998.
ISS (International Space Station)
The first three member crew arrived at the station in 2000 and performed experiments. i.e – they were able to grow cell tissue more easily in space than they can on Earth.
Research and technological advances from the space station may lay the groundwork for new space exploration.
One of the advantage of
space shuttles over earlier
spacecraft is that they can be
reused.
Flybys
The first stage in space exploration is to send out a spacecraft that passes one or more planets or other bodies in space without orbiting them.
After a flyby spacecraft leaves Earth’s orbit, controllers on Earth can use the spacecraft’s small rockets to adjust its direction.
As a flyby spacecraft passes a planet, the planet’s gravity can be used to change the spacecraft’s speed or direction.
Many complex mathematical calculations are needed for a flyby mission to be successful. The period of time when a spacecraft can be launched is called a launch window.
OrbitersThe second stage in space exploration is to study a planet over a long period of time. These tasks are done by orbiters.
An orbiter can keep track of changes that occur over time, such as changes in weather and volcanic activity. They allow astronomers to create detailed maps of planets and some are designed to explore moons or other bodies in space instead of planets.
Landers and Probes
The third stage in space exploration is to land instruments on a planet or to send instruments through its atmosphere.
A lander is a craft designed to land on planet’s surface.
After a lander touches down, controllers on Earth can send it commands to collect data.
A lander may also contain a small vehicle called a rover, which can explore beyond the landing site.
Mars Pathfinder in 1997 sent back thousands of photographs. The images provided evidence that water once flowed over the surface of Mars.
The term probe is often used to describe a spacecraft that drops into a planet’s atmosphere. As the probe travels through the atmosphere its instruments identify gases and measure properties such as pressure and temperature.
A lander or a probe can work in combination with an orbiter.
Saturday, July 14, 2012
Tuesday, July 3, 2012
Monday, July 2, 2012
Ancient Civilization Ch.9 Lesson1
A Time of Glory in Athens
The Persian Wars
Greek city-states rebelled against Persia and during the uprising, they burned Sardis, the western capital of Persian EmpireGreek city-states united to fight against the Persian Empire
Darius I landed near the plain of Marathon and outnumbered the Athenians two to one
The Athenians asked Sparta for help but they feared Spartans would arrive too late and so the Athenian general devised a strategic plan to defeat the Persians.
Greek Victories
Persian emperor Xerxes, son of Darius I, was faced by a small Greek force at a mountain pass called Thermopylae.
The Persians broke through and set Athens on fire.
However, the Athenian navy was ready to face the Persians in a narrow straight between the Greek coastline and the island of Salamis.
Although the Greeks were outnumbered, the smaller Greek ships defeated the Persians in the narrow straight and sent Xerxes back to Asia Minor.
On land, the Spartans had been victorious in the Battle of Plataea
After the Persian wars, 15- Greek city-states formed the Delian League
The Delian Leagues won many victories, with Sparta and Athens contributing to win but conflict arose between the two city-states
Emperor Xerxes of Persia almost conquered the Greeks. In key victories, however, the Athenian
navy defeated the Persians at sea, and the Spartans beat them on land
Democracy in AthensCleisthenes made reforms to help Athens form a democracy
Direct democracy: all male Athenians over 18 were allowed to vote while woman and slaves were not
Veto ( A council proposed laws to the assembly, which would accept or veto them by majority.)
Representative democracy: citizens elect people to make decisions
Pericles made a more democratic reform
He believed all citizens, rich and poor, should be able to serve equally in government
The Golden Age
A time of great cultural achievement in Athens is known as the Golden Age
Athens continued to receive tribute from members of the Delian League
Pericles worked hard to make Athens an example of Greece
Greeks advanced in art, poetry, education, philosophy, science, and mathematics, and medicine
During the Golden Age of Athens, leaders built grand public buildings to celebrate Athenian democracy
and culture. It was a time of artistic, scholarly, and economic growth.
The Persian Wars
Greek city-states rebelled against Persia and during the uprising, they burned Sardis, the western capital of Persian EmpireGreek city-states united to fight against the Persian Empire
Darius I landed near the plain of Marathon and outnumbered the Athenians two to one
The Athenians asked Sparta for help but they feared Spartans would arrive too late and so the Athenian general devised a strategic plan to defeat the Persians.
Greek Victories
Persian emperor Xerxes, son of Darius I, was faced by a small Greek force at a mountain pass called Thermopylae.
The Persians broke through and set Athens on fire.
However, the Athenian navy was ready to face the Persians in a narrow straight between the Greek coastline and the island of Salamis.
Although the Greeks were outnumbered, the smaller Greek ships defeated the Persians in the narrow straight and sent Xerxes back to Asia Minor.
On land, the Spartans had been victorious in the Battle of Plataea
After the Persian wars, 15- Greek city-states formed the Delian League
The Delian Leagues won many victories, with Sparta and Athens contributing to win but conflict arose between the two city-states
Emperor Xerxes of Persia almost conquered the Greeks. In key victories, however, the Athenian
navy defeated the Persians at sea, and the Spartans beat them on land
Democracy in AthensCleisthenes made reforms to help Athens form a democracy
Direct democracy: all male Athenians over 18 were allowed to vote while woman and slaves were not
Veto ( A council proposed laws to the assembly, which would accept or veto them by majority.)
Representative democracy: citizens elect people to make decisions
Pericles made a more democratic reform
He believed all citizens, rich and poor, should be able to serve equally in government
The Golden Age
A time of great cultural achievement in Athens is known as the Golden Age
Athens continued to receive tribute from members of the Delian League
Pericles worked hard to make Athens an example of Greece
Greeks advanced in art, poetry, education, philosophy, science, and mathematics, and medicine
During the Golden Age of Athens, leaders built grand public buildings to celebrate Athenian democracy
and culture. It was a time of artistic, scholarly, and economic growth.
Sunday, July 1, 2012
Space Science 1.1
The sky seems to turn as Earth rotates
You cannot see all of the constellations at once, because Earth blocks half of space from your view.
You can see a parade of constellations each night as Earth rotates because stars move from east to west. If you extended the North Pole into space, it would point almost exactly to a star called Polaris, or the North Star. You can use Polaris to figure out direction and location.
The movements of planets and other nearby objects are visible from Earth.
Stars are always moving , but they are so far away that you cannot see their movements.
By contrast, the Moon moves across the star background a distance equal to its width every hour as it orbits Earth. The planet’s gradual movements are visible among the constellations over a period of weeks or month.
The apparent movement of the sky led early astronomers to believe that Earth was at the center of the universe. Later astronomers discovered that Earth and the other planets orbit the Sun.
Thursday, June 21, 2012
SS Ch.8 Lesson3
Greek City-States /The Rise of City-StatesBy 750 B.C., settlements such as Sparta, Athens, Argos, and Corinth had grown into a polis.
A polis…
Connected the city with farms, towns, and villages
All people were free citizens
Had about 5,000 people, with the exception of Athens(20,000) and Corinth(10,000)
Most city-states developed similarly
Started at the base of a hill
An acropolis sat at the top of the hill
Surrounding the acropolis were houses, temples, and an open-air market (agora)
Agora was the center of politics
Each city-state were separated by mountains and seas thus developing independently
The Rise of City-States
By 750 B.C., large
settlements had
grown into independent
city-states. The city-states
developed in similar ways,
most starting at the
base of acropolis.
New Ways of Governing
By 750 B.C., a small group of aristocrats, wealthy ruling class, replaced kings.
Oligarchy: Rule by a few
Each controlled army, economy, religion, and laws
Tyrants: Took control of government by force and ruled alone
Tyrant means “a cruel ruler”
By 500 B.C., tyrants were overthrown and democracy began
As city-states developed,
oligarchies replaced the
rule of kings. Then tyrants
took over many city-states.
By 500 B.C., early forms of
democracy were beginning
to replace tyrants in
some city-states.
Commerce and ColoniesCommerce: large-scale trade
City-states exchanged:
Grain, wine, olive oil, wood, pottery, and metal works, such as iron weapons and tools
In search of more resources, city-states set up colonies beyond their land
Colonies became independent but were tied to homeland through religion and trade
Commerce and Colonies
By about 700 B.C., the Greeks had become part of a growing commerce around the Mediterranean
and beyond. As populations expanded, the city-states began to colonize areas beyond the Aegean.
Greek CultureGreeks felt a strong connection, or cultural indentity with other all other Greeks.
Greeks based their alphabet on the Phoenician alphabet
Greeks used writing for:
Keep records of business and trade
Record codes of law
Government, taxes, history
Beliefs
Legends and myths
Greeks learned about the past and heritage through the work of Homer and Hesiod
It taught them: Gods’ names, talents, skills, appearance
Greeks learned about the past and heritage through the work of Homer and Hesiod
It taught them: Gods’ names, talents, skills, appearance
While the ancient Greeks
identified with their own
city-states, they also felt
a strong connection
with all Greeks due to
their common language
and shared culture.
A New Kind of Warfare
Greeks fought over land and resources
All male adult citizens served at least some time in the army
Rank was based on wealth
Wealthiest men were leaders
Those able to afford a horse were in the calvary
Foot soldiers called hoplites were the poorest and lowest in rank
A New Kind of Warfare
Greek city-states often
fought over land and resources.
Each city-state had
a large, highly organized army composed of adult
male citizens who were
trained to fight in
new formations.
A polis…
Connected the city with farms, towns, and villages
All people were free citizens
Had about 5,000 people, with the exception of Athens(20,000) and Corinth(10,000)
Most city-states developed similarly
Started at the base of a hill
An acropolis sat at the top of the hill
Surrounding the acropolis were houses, temples, and an open-air market (agora)
Agora was the center of politics
Each city-state were separated by mountains and seas thus developing independently
The Rise of City-States
By 750 B.C., large
settlements had
grown into independent
city-states. The city-states
developed in similar ways,
most starting at the
base of acropolis.
New Ways of Governing
By 750 B.C., a small group of aristocrats, wealthy ruling class, replaced kings.
Oligarchy: Rule by a few
Each controlled army, economy, religion, and laws
Tyrants: Took control of government by force and ruled alone
Tyrant means “a cruel ruler”
By 500 B.C., tyrants were overthrown and democracy began
As city-states developed,
oligarchies replaced the
rule of kings. Then tyrants
took over many city-states.
By 500 B.C., early forms of
democracy were beginning
to replace tyrants in
some city-states.
Commerce and ColoniesCommerce: large-scale trade
City-states exchanged:
Grain, wine, olive oil, wood, pottery, and metal works, such as iron weapons and tools
In search of more resources, city-states set up colonies beyond their land
Colonies became independent but were tied to homeland through religion and trade
Commerce and Colonies
By about 700 B.C., the Greeks had become part of a growing commerce around the Mediterranean
and beyond. As populations expanded, the city-states began to colonize areas beyond the Aegean.
Greek CultureGreeks felt a strong connection, or cultural indentity with other all other Greeks.
Greeks based their alphabet on the Phoenician alphabet
Greeks used writing for:
Keep records of business and trade
Record codes of law
Government, taxes, history
Beliefs
Legends and myths
Greeks learned about the past and heritage through the work of Homer and Hesiod
It taught them: Gods’ names, talents, skills, appearance
Greeks learned about the past and heritage through the work of Homer and Hesiod
It taught them: Gods’ names, talents, skills, appearance
While the ancient Greeks
identified with their own
city-states, they also felt
a strong connection
with all Greeks due to
their common language
and shared culture.
A New Kind of Warfare
Greeks fought over land and resources
All male adult citizens served at least some time in the army
Rank was based on wealth
Wealthiest men were leaders
Those able to afford a horse were in the calvary
Foot soldiers called hoplites were the poorest and lowest in rank
A New Kind of Warfare
Greek city-states often
fought over land and resources.
Each city-state had
a large, highly organized army composed of adult
male citizens who were
trained to fight in
new formations.
SS Ch.8 Lesson4
Sparta and Athens
Sparta’s government
Sparta, located on Peloponnesus, was the most powerful city-state on Peloponnesus
Spartans were descendents of Dorians
Helots, slaves owned by city-state, grew in number (1 Spartan=4 Helots)
In fear of rebellion of the Helots and enemies, the Spartans lived a military life
Life in SpartaSpartans learned to be strong and disciplined
Spartan boys / Age 7
Sent to training camps; lived together in barracks
Practiced wrestling, gymnastics, and military exercises
Learned to accept hardship without complaint and to obey orders without question
Life in Sparta
Age 18Began four years of military training to serve as soldiers
Could marry between 20 and 30
Served as soldiers until 60
Spartan girls
Exercised outdoors
Managed household and family
Life in SpartaSpartan leaders: Rarely allowed travel outside of Sparta
Trade with outsiders
Enforced a strict way of life
Why?
Because leaders didn’t want new ideas might bring unwanted change
Sparta means “simple, strict, and highly desciplined”
New Ideas in athensAthens grew wealthy from trade because their location allowed them to have many trading partners.
In 638 B.C., oligarchy replaced monarchy
In 620 B.C., Draco wrote first laws for Athens
Athens grew angry and distrustful when farmers fell into debt and couldn’t supply food
New Ideas in athens
Athens coastal location helped
it become wealthy through
trade. Draco wrote Athens’s
first laws, but they were harsh.
Solon put in place reforms
to help ordinary people.
Toward DemocracySolon set up a system that based political right on wealth and not on birth
Rights were divided in 4 classes and it was based on agricultural wealth
Most wealth= highest class
Men without property= lowest class
Persian king Cyrus II, known as “Cyrus the Great” founded Persian Empire by conquest
Emperors Cambyses and Darius I followed Cyrus and made the largest empire in history at the time
Darius I developed a government divided into 20 different regions who had a governor
Concerns about persia
When Persians conquered Asia Minor, they got control of several Greek colonies but the Persians wanted t complete control.
The Spartans began to fear the Persians and so they created a league, or a group of allies, called the Peloponnesian League
Sparta’s government
Sparta, located on Peloponnesus, was the most powerful city-state on Peloponnesus
Spartans were descendents of Dorians
Helots, slaves owned by city-state, grew in number (1 Spartan=4 Helots)
In fear of rebellion of the Helots and enemies, the Spartans lived a military life
Life in SpartaSpartans learned to be strong and disciplined
Spartan boys / Age 7
Sent to training camps; lived together in barracks
Practiced wrestling, gymnastics, and military exercises
Learned to accept hardship without complaint and to obey orders without question
Life in Sparta
Age 18Began four years of military training to serve as soldiers
Could marry between 20 and 30
Served as soldiers until 60
Spartan girls
Exercised outdoors
Managed household and family
Life in SpartaSpartan leaders: Rarely allowed travel outside of Sparta
Trade with outsiders
Enforced a strict way of life
Why?
Because leaders didn’t want new ideas might bring unwanted change
Sparta means “simple, strict, and highly desciplined”
New Ideas in athensAthens grew wealthy from trade because their location allowed them to have many trading partners.
In 638 B.C., oligarchy replaced monarchy
In 620 B.C., Draco wrote first laws for Athens
Athens grew angry and distrustful when farmers fell into debt and couldn’t supply food
New Ideas in athens
Athens coastal location helped
it become wealthy through
trade. Draco wrote Athens’s
first laws, but they were harsh.
Solon put in place reforms
to help ordinary people.
Toward DemocracySolon set up a system that based political right on wealth and not on birth
Rights were divided in 4 classes and it was based on agricultural wealth
Most wealth= highest class
Men without property= lowest class
Persian king Cyrus II, known as “Cyrus the Great” founded Persian Empire by conquest
Emperors Cambyses and Darius I followed Cyrus and made the largest empire in history at the time
Darius I developed a government divided into 20 different regions who had a governor
Concerns about persia
When Persians conquered Asia Minor, they got control of several Greek colonies but the Persians wanted t complete control.
The Spartans began to fear the Persians and so they created a league, or a group of allies, called the Peloponnesian League
Wednesday, June 20, 2012
SS Ch8 Lesson 2
The Minoans
The first civilization in Greece was on the island of Crete and was named after the king, Minos.
Crete
Long island
Mountains and plains
Climate was mild, not too hot or cold
Minoans lived in small farming and fishing villages
The Minoans began to build cities and within it, they built large and richly decorated palaces
The palace was at the heart of Minoan social life and served as the center for government and religion
The largest Minoan palace(3 acres and 3 stories high) was built in the city of Knossos
Minoan LifePaintings on palace walls reveal:
Dancing
Music
Sports
Gold
Long flowing hair on both men and woman
Minoans traded olive oil, wine, wool, and pottery for copper, tin, and gold.
Minoans have a developed writing to record trade
A few possible reasons for the destruction of Minoan culture:Fire
Volcanic eruption
Earthquake
Possibility of being over-run by the Mycenaeans
The MycenaeansMycenae, warlike people, were mostly peasants or poor farmers
They are considered the first Greeks because of their language(an early form of Greek)
Mycenae was on Peloponnesus
The Mycenaeans took ideas from other cultures, a process called cultural borrowing
In about 1450 B.C., the Mycenaens invaded Crete and continued to spread their culture
In 1100 B.C., their control weakened. Two possible reasons:
Dorians from the north
Fighting within their own culture
The Mycenaean civilization developed
on the Peloponnesus. The Myceaneans
adopted many customs from the
Minoans and made their own.
The warlike Mycenaeans controlled
Crete and much of the Peloponnesus
until about 1100 B.C.
Legends and Myths
Greeks developed a great tradition of storytellers called bards.
They told stories and songs about Greek gods, goddesses, and heroes
They were entertaining but also taught ideals, values, and beliefs
Legends are an important part of their tradition and could possibly be based on actual events
Homer, a bard, composed two epics
Iliad -Describes attacks on Troy
Odyssey -Describes the hero Odysseus and his ten-year journey home
The Greek Dark Age
By 1100 B.C., ancient Greece had entered the Dark Age:
Greeks abandoned their palaces and cities
Trade stopped
Lived a simpler life as farmers and herders
What was lost?
Minoans and Myceneans achievements
Writing, decorative pottery, luxury goods, and bronze metal work
At the end of the Dark Age, a stronger metal emerged: Iron.
The Greek Dark Age
During the Greek Dark Age,
Greek culture declined.
The first civilization in Greece was on the island of Crete and was named after the king, Minos.
Crete
Long island
Mountains and plains
Climate was mild, not too hot or cold
Minoans lived in small farming and fishing villages
The Minoans began to build cities and within it, they built large and richly decorated palaces
The palace was at the heart of Minoan social life and served as the center for government and religion
The largest Minoan palace(3 acres and 3 stories high) was built in the city of Knossos
Minoan LifePaintings on palace walls reveal:
Dancing
Music
Sports
Gold
Long flowing hair on both men and woman
Minoans traded olive oil, wine, wool, and pottery for copper, tin, and gold.
Minoans have a developed writing to record trade
A few possible reasons for the destruction of Minoan culture:Fire
Volcanic eruption
Earthquake
Possibility of being over-run by the Mycenaeans
The MycenaeansMycenae, warlike people, were mostly peasants or poor farmers
They are considered the first Greeks because of their language(an early form of Greek)
Mycenae was on Peloponnesus
The Mycenaeans took ideas from other cultures, a process called cultural borrowing
In about 1450 B.C., the Mycenaens invaded Crete and continued to spread their culture
In 1100 B.C., their control weakened. Two possible reasons:
Dorians from the north
Fighting within their own culture
The Mycenaean civilization developed
on the Peloponnesus. The Myceaneans
adopted many customs from the
Minoans and made their own.
The warlike Mycenaeans controlled
Crete and much of the Peloponnesus
until about 1100 B.C.
Legends and Myths
Greeks developed a great tradition of storytellers called bards.
They told stories and songs about Greek gods, goddesses, and heroes
They were entertaining but also taught ideals, values, and beliefs
Legends are an important part of their tradition and could possibly be based on actual events
Homer, a bard, composed two epics
Iliad -Describes attacks on Troy
Odyssey -Describes the hero Odysseus and his ten-year journey home
The Greek Dark Age
By 1100 B.C., ancient Greece had entered the Dark Age:
Greeks abandoned their palaces and cities
Trade stopped
Lived a simpler life as farmers and herders
What was lost?
Minoans and Myceneans achievements
Writing, decorative pottery, luxury goods, and bronze metal work
At the end of the Dark Age, a stronger metal emerged: Iron.
The Greek Dark Age
During the Greek Dark Age,
Greek culture declined.
Science 5.3 Science helps people
scientific understanding helps people fight disease.
Disease is a change that disturbs the normal functioning of the body’s systems.
Many diseases are classified as infectious diseases, or diseases that can be spread.
The organisms that cause sickness are called microorganisms.
Disease is a change that disturbs the normal functioning of the body’s systems.
Many diseases are classified as infectious diseases, or diseases that can be spread.
The organisms that cause sickness are called microorganisms.
Monday, June 18, 2012
Human Biology 5.2
Diet affects the body’s health
Nutrition is the study of the materials that nourish your body.
Your body needs proper nutrition to stay healthy and to function well.
Getting Nutrientssix classes of nutrients: carbohydrate, protein, fat, vitamin, mineral, water
Proteins: molecules that build tissues used for growth and repair.
(poultry, red meat, fish, eggs, nuts, beans, grains…etc.)
Carbohydrates: the body’s most important energy source and are found in
starch, sugar, and fiber. (past, bread, fruits, and vegetables…etc)
Fats: essential for energy. (butter, olive oil…etc)
Vitamins: small molecules that regulate body growth and development.
Minerals: help build body tissue
Water: helps regulate your body temperature, transports nutrients around the body.
Understanding Nutrition
Groups within the government, (the United States Department of Agriculture) have defined terms that are used to describe food products.
All natural -it does not contain any artificial flavor, color, or preservatives.
Low-fat -provides no more than 3grams of fat per serving.
Organic- produce has been grown using no human made fertilizers or live stock has been raised on organic feed.
Exercise & Lifestyle
Regular exercise allows all your body systems to stay strong and healthy. (extra oxygen, stronger skeletal and circulatory system…etc.)
An active lifestyle can promote good health and a sedentary lifestyle can promote excess body fat and disease.
Researchers have also made connections between excess body fat and heart disease and diabetes.
Drug AbuseA drug is any chemical substance that you take in to change your body’s functions. Abuse can also include using too much of a substance that is not harmful in small amounts.
Tobacco: Tobacco smoke contains thousands of chemicals.
(nicotine, tar, carbon monoxide)
Alcohol: It damages the heart, the liver, the nervous system, digestive system, and it can affect behavior and the ability to make decisions.
Other drugs: cocaine, amphetamines, narcotics are very dangerous.
Addiction
Drug abuse can often lead to addiction.
Addiction is an illness in which a person becomes dependent on a substance or behavior.
Repeated use of drugs can cause the body to become physically dependent and also emotionally dependent.
When a person is dependent on a drug, taking away that drug can cause withdrawal. (fever, muscle cramps, vomiting, and hallucinations.)
Eating DisordersAn eating disorder is a condition in which people continually eat too much or too little food.
Anorexia nervosa: people which this
disorder eat so little and exercise
so hard that they become unhealthy.
Nutrition is the study of the materials that nourish your body.
Your body needs proper nutrition to stay healthy and to function well.
Getting Nutrientssix classes of nutrients: carbohydrate, protein, fat, vitamin, mineral, water
Proteins: molecules that build tissues used for growth and repair.
(poultry, red meat, fish, eggs, nuts, beans, grains…etc.)
Carbohydrates: the body’s most important energy source and are found in
starch, sugar, and fiber. (past, bread, fruits, and vegetables…etc)
Fats: essential for energy. (butter, olive oil…etc)
Vitamins: small molecules that regulate body growth and development.
Minerals: help build body tissue
Water: helps regulate your body temperature, transports nutrients around the body.
Understanding Nutrition
Groups within the government, (the United States Department of Agriculture) have defined terms that are used to describe food products.
All natural -it does not contain any artificial flavor, color, or preservatives.
Low-fat -provides no more than 3grams of fat per serving.
Organic- produce has been grown using no human made fertilizers or live stock has been raised on organic feed.
Exercise & Lifestyle
Regular exercise allows all your body systems to stay strong and healthy. (extra oxygen, stronger skeletal and circulatory system…etc.)
An active lifestyle can promote good health and a sedentary lifestyle can promote excess body fat and disease.
Researchers have also made connections between excess body fat and heart disease and diabetes.
Drug AbuseA drug is any chemical substance that you take in to change your body’s functions. Abuse can also include using too much of a substance that is not harmful in small amounts.
Tobacco: Tobacco smoke contains thousands of chemicals.
(nicotine, tar, carbon monoxide)
Alcohol: It damages the heart, the liver, the nervous system, digestive system, and it can affect behavior and the ability to make decisions.
Other drugs: cocaine, amphetamines, narcotics are very dangerous.
Addiction
Drug abuse can often lead to addiction.
Addiction is an illness in which a person becomes dependent on a substance or behavior.
Repeated use of drugs can cause the body to become physically dependent and also emotionally dependent.
When a person is dependent on a drug, taking away that drug can cause withdrawal. (fever, muscle cramps, vomiting, and hallucinations.)
Eating DisordersAn eating disorder is a condition in which people continually eat too much or too little food.
Anorexia nervosa: people which this
disorder eat so little and exercise
so hard that they become unhealthy.
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