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Atmosphere Review
Test Description: Atmosphere Review
Instructions: Answer all questions to get your test result.
1) The percentage of oxygen in the atmosphere is
A
less than 1 percent
B
78 percent
C
21 percent
D
99 percent
2) 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
3) Photochemical smog is caused by the action on chemicals of
A
sunlight
B
rain
C
ozone
D
lightning
4) Harmful substances in air, water, or soil are called
A
soot
B
particles
C
dust
D
pollutants
5) The amount of mass in a given volume of a substance is its
A
altitude
B
weight
C
pressure
D
density
6) As the density of air decreases, its pressure
A
doubles
B
stays the same
C
decreases
D
increases
7) Air pressure is measured in
A
liters
B
grams
C
millibars
D
square meters
8) The warmest layer of the atmosphere is the
A
thermosphere
B
stratosphere
C
mesosphere
D
troposphere
9) The layer of the atmosphere that reflects radio waves is the
A
troposphere
B
mesosphere
C
thermosphere
D
stratosphere
10) The stratosphere helps protect Earth from too much ultraviolet radiation because this layer of the atmosphere contains
A
ions
B
carbon dioxide
C
ozone
D
water vapor
*select an answer for all questions
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