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nitrogen
colorless, odorless gas that makes up about 78% of the Earth's atmosphere.
oxygen
colorless, odorless gas that is essential for life on Earth and makes up about 21% of the Earth's atmosphere.
carbon dioxide
colorless, odorless gas composed of one carbon atom and two oxygen atoms.
argon
colorless, odorless, inert gas that is a member of the noble gases group in the periodic table.
water vapor
the gaseous state of water.
troposphere
the lowest layer of Earth's atmosphere, extending from the surface up to about 8 to 15 kilometers (5 to 9 miles) high.
stratosphere
the second layer of Earth's atmosphere, located above the troposphere and below the mesosphere.
mesosphere
the third layer of Earth's atmosphere, located above the stratosphere and below the thermosphere.
thermosphere
a layer of Earth's atmosphere located above the mesosphere and below the exosphere, typically ranging from about 85 km (53 miles) to 600 km (373 miles) above sea level.
Where is the ozone layer located?
within the stratosphere