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The amount of mass in a given volume of a substance is its
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
The stratosphere helps protect Earth from too much ultraviolet radiation because this layer of the atmosphere contains
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
Photochemical smog is caused by the action on chemicals of
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
A gas in the atmosphere that varies between zero and five percent in different places is
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
Harmful substances in air, water, or soil are called
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
The layer of the atmosphere that reflects radio waves is the
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
The percentage of oxygen in the atmosphere is
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
The warmest layer of the atmosphere is the
sunlight
thermosphere
thermosphere
water vapor
density
21 percent
ozone
pollutants
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