Earth's Atmosphere

Front

What are the two layers of Earth's atmosphere where temperature decreases with altitude?

Back

Mesosphere and Troposphere.

Front

What percentage of the atmosphere is made up of oxygen?

Back

Approximately 20%.

Front

What is the coldest layer of the atmosphere?

Back

Mesosphere.

Front

Why are air temperatures near mountaintops often colder than at sea level?

Back

Air near mountaintops is less dense.

Front

What is the layer of the atmosphere where weather occurs?

Back

Troposphere.

Front

What is the layer above the troposphere?

Back

Stratosphere.

Front

What gas is most abundant in Earth's atmosphere?

Back

Nitrogen, making up about 78%.

Front

What is the term for the boundary between the troposphere and stratosphere?

Back

Tropopause.

Front

What happens to temperature in the stratosphere as altitude increases?

Back

Temperature increases due to the ozone layer.

Front

What is the role of the ozone layer?

Back

It absorbs and scatters ultraviolet solar radiation.