The percentage of oxygen in the atmosphere is

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

Photochemical smog is caused by the action on chemicals of

Harmful substances in air, water, or soil are called

The amount of mass in a given volume of a substance is its

As the density of air decreases, its pressure

Air pressure is measured in

The warmest layer of the atmosphere is the

The layer of the atmosphere that reflects radio waves is the

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

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