Front

The atmosphere is __?__.

Back

the layer of gases that surrounds Earth

Front

Earth's atmosphere is important to living things because it __?__.

Back

provides all the gases that living things need to survive

Front

Earth's atmosphere traps energy from the sun, which __?__.

Back

allows water to exist as a liquid

Front

Photochemical smog results from the interaction of pollutants in the presence of __?__.

Back

sunlight

Front

As you rise upwards in the atmosphere, air pressure __?__.

Back

decreases

Front

When climbing a mountain, you get out of breath easily because __?__.

Back

there is less oxygen in each cubic meter of air

Front

Weather occurs in which layer of our atmosphere?

Back

troposphere

Front

The ozone layer protects living things on Earth from what?

Back

ultraviolet (UV) radiation

Front

Which layer of the atmosphere protects Earth's surface from being hit by most meteoroids?

Back

mesosphere

Front

Heat transfer between two substances that are in contact is called __?__.

Back

conduction