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Air is LESS dense at... HIGH altitudes What are the two most common gases in air? nitrogen and oxygen What is an example of something that takes part of the carbon cycle? animals add CARBON dioxide to the air About half of the sun's energy is..... absorbed by Earth's surface How does heat energy get from Earth's surface to air? conduction Which part of the atmosphere contains a type of gas that absorbs UV radiation? stratosphere How does the atmosphere keep Earth's surface warm? certain gases absorb and emit infrared radiation Examples of air pollutant smog, ozone, pollen Living houses that use LESS energy... REDUCES greenhouse gases