The part of the atmosphere that contains the ozone layer is the:

The thin layer of gases that surrounds the earth is the:

The layer of the atmosphere that is closest to earth, which contains the air we breathe:

Which of the following gases makes up most of the atmosphere?

Which gas is used by plants for photosyntesis and released by all living things during cellular respiration?

Distance from the equator, measured in degrees is called

Since 1958, the amount of carbon dioxide in the atmosphere has:

The Earth's atmosphere is made up of _____ layers.

The carbon dioxide in the atmosphere helps keep in:

Living things could not exist on land until the process of _____ evolved.

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