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16 Cards in this Set
- Front
- Back
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atmosphere
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thin layer of air that forms a protective covering around the planet
Maintains a balance between the amount of heat absorbed from the sun and the amount of heat that escapes back into space. It also protects life forms from some of the Sun's harmful rays. |
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atmosphere is a mixture of......
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gases, solids, and liquids that surrounds the planet.
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Earth's early atmosphere was produced by......
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erupting volcanoes that contained nitrogen and carbon dioxide, but little oxygen.
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What did earth's early organisms do?
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released oxygen into the atmosphere as they made food with the aid of sunlight.
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What were early organisms limited to?
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layers of ocean water deep enough to be shielded from the Sun's harmful rays, yet close enough to the surface to recieve sunlight.
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What does the ozone protect the Earth from?
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The Sun's harmful rays formed in the upper atmosphere.
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What is the most abundant gas?
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Nitrogen
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what percent does nitrogen make up in the atmosphere?
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78 percent
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What percent does oxygen make up in Earth's atmosphere?
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21 percent
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what percent is water vapor in the atmosphere?
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4 percent
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what causes smog?
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pollutants mix with oxygen and other chemicals in the presence of sunlight.
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what percent of water vapor does the troposphere have?
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99 percent
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what percent of atmospheric gases does a troposphere have?
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75 percent
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rain, snow, and clouds occur in the troposphere.
How much does it extend to? |
10 km.
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how much does the stratosphere extend to?
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10 km. to 50 km.
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a portion of the stratosphere contains higher levels of gas called.....
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ozone
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