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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