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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
99 percent
B
21 percent
C
78 percent
D
less than 1 percent
2) A gas in the atmosphere that varies between zero and five percent in different places is
A
nitrogen
B
methane
C
oxygen
D
water vapor
3) Photochemical smog is caused by the action on chemicals of
A
rain
B
ozone
C
sunlight
D
lightning
4) Harmful substances in air, water, or soil are called
A
particles
B
soot
C
pollutants
D
dust
5) The amount of mass in a given volume of a substance is its
A
density
B
weight
C
pressure
D
altitude
6) As the density of air decreases, its pressure
A
stays the same
B
increases
C
doubles
D
decreases
7) Air pressure is measured in
A
millibars
B
liters
C
square meters
D
grams
8) The warmest layer of the atmosphere is the
A
mesosphere
B
stratosphere
C
thermosphere
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
water vapor
B
ions
C
ozone
D
carbon dioxide
*select an answer for all questions
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