Atmosphere Review

Match it! Select the correct answer from the pull down...Good luck!

Photochemical smog is caused by the action on chemicals of

As the density of air decreases, its pressure

The layer of the atmosphere that reflects radio waves is the

Air pressure is measured in

Harmful substances in air, water, or soil are called

The percentage of oxygen in the atmosphere is

A gas in the atmosphere that varies between zero and five percent in different places is

The stratosphere helps protect Earth from too much ultraviolet radiation because this layer of the atmosphere contains