Shared Flashcard Set

Details

Harry
Atmosphere
17
Science
7th Grade
04/10/2014

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Cards

Term
Atmosphere
Definition
layer of gases that surrounds a planet
Term
Where did the oxygen in the atmosphere come from?
Definition
First organisms (algae)
Term
What is the atmosphere made of?
Definition
1.Nitrogen (78%)
2.Oxygen (21%)
3.Water vapor, carbon dioxide (1%)
Term
What percent of the atmosphere is nitrogen?
Definition
78%
Term
What percent of the atmosphere is oxygen?
Definition
21%
Term
What percent of the atmosphere is water vapor/ carbon dioxide?
Definition
1%
Term
What are the four reasons why the atmosphere is important to us?
Definition
1.Provides us with oxygen
2.Stabilizes surface temperature (traps solar heat)
3.Protects us from meteors (they burn up)
4.Ozone layer protects us from harmful rays (UV- ultraviolet light)
Term
What are the layers of the atmosphere?
Definition
troposphere, stratosphere, mesosphere, thermosphere, exosphere
Term
What layer of the atmosphere do we live in?
Definition
the troposphere
Term
How do you know when you have entered a different layer of the atmosphere?
Definition
The temperature changes
Term
Atmospheric pressure
Definition
pressure caused by air molecules above
Term
Where is air pressure greatest?
Definition
at the surface
Term
What are two functions of the ozone layer?
Definition
-ozone (O3) layer protects us against UV rays
-absorbs energy from UV rays
Term
What destroys the ozone layer?
Definition
chlorofluorocarbon (CFCs)
Term
Where can you find CFCs/ what are they?
Definition
chemicals from aerosol sprays, refrigerators, and air conditioning units
Term
Where is an ozone hole forming?
Definition
over Antarctica
Term
True/False
Some governments have banned CFCs.
Definition
True
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