Water and Atmosphere

Front

What is the ozone layer?

Back

A layer in the Earth's stratosphere that absorbs most of the Sun's harmful ultraviolet radiation.

Front

What gas makes up 78% of the Earth's atmosphere?

Back

Nitrogen.

Front

What would happen to life on Earth if the ozone layer were destroyed?

Back

Life on Earth would die from too much solar radiation.

Front

What happens to air pressure as altitude increases?

Back

Air pressure decreases.

Front

What is runoff?

Back

Water that flows over the ground surface and returns to bodies of water after precipitation.

Front

What is evaporation?

Back

The process by which water changes from a liquid to a gas.

Front

What is condensation?

Back

The process by which water vapor in the air cools and changes back into liquid water.

Front

What is precipitation?

Back

Any form of water, liquid or solid, that falls from the atmosphere to the Earth's surface, such as rain, snow, sleet, or hail.

Front

What is the primary function of the ozone layer?

Back

To protect living organisms from harmful ultraviolet (UV) radiation from the sun.

Front

What is the composition of dry air?

Back

Approximately 78% nitrogen, 21% oxygen, and 1% other gases.