Atmosphere Review: Question Preview (ID: 28904)

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The percentage of oxygen in the atmosphere is
a) 21 percent b) less than 1 percent c) 78 percent d) 99 percent
A gas in the atmosphere that varies between zero and five percent in different places is
a) water vapor b) nitrogen c) oxygen d) methane
Photochemical smog is caused by the action on chemicals of
a) sunlight b) lightning c) ozone d) rain
Harmful substances in air, water, or soil are called
a) pollutants b) particles c) soot d) dust
The amount of mass in a given volume of a substance is its
a) density b) weight c) altitude d) pressure
As the density of air decreases, its pressure
a) decreases b) increases c) stays the same d) doubles
Air pressure is measured in
a) millibars b) grams c) liters d) square meters
The warmest layer of the atmosphere is the
a) troposphere b) stratosphere c) mesosphere d) thermosphere
The layer of the atmosphere that reflects radio waves is the
a) thermosphere b) troposphere c) stratosphere d) mesosphere
The stratosphere helps protect Earth from too much ultraviolet radiation because this layer of the atmosphere contains
a) ozone b) ions c) carbon dioxide d) water vapor
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