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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