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Chapter 2
Test Review
7 TH G R A D E
2013-2014
1
Which answer best describes the Earth’s atmosphere?
a. Mostly nitrogen with about 21% carbon dioxide
b. Mostly carbon dioxide with about 21% oxygen
c. Mostly nitrogen with about 21% oxygen
Answer
c. Mostly nitrogen with about 21% oxygen
2
What causes differences in air temperatures at
different altitudes?
Answer
Mainly the way gases absorb solar energy
3
How much energy radiated by the sun reaches Earth?
a. About 80%
b. About 50%
c. About two-billionths
d. About one one-hundreths
4
 One reason for global warming may be
 A. decreasing global gases
 Increasing global gases
 Increasing greenhouse gases
 Decreasing greenhouse gases
Answer
C. Increasing greenhouse gases
5
What causes wind?
a. Differences in air pressure
b. Differences in gravity
c. Differences in oxygen
d. Differences in the thermosphere
answer
a. Differences in air pressure
6
What causes differences in air pressure around the
Earth?
a. Warm air rises at the equator and cold air sinks at
the poles
b. Warm air sinks at the equator and cold air rises at
the poles
c. Warm air rises at the equator and cold air rises at
the poles
Answer
a. Warm air rises at the equator and cold air sinks at
the poles
7
\Local winds are produced by
Answer
Local geographic features
8
Mountain and valley breezes are caused by
a. Differences in temperature and elevation
b. Similarities in temperature and elevation
c. The same temperature at all elevations
d. High temperatures at all elevations
Answer
 A. differences in temperature and elevation
9
 Why is air pressure greatest at the Earth’s surface?
Answer
Gravity pulls the molecules toward the surface
Things To Know
Radiation
thermal conduction
Convection
greenhouse effect
Radiation balance
convection cells
Coriolis Effect
trade winds
Polar easterlies
jet stream
Atmosphere
ozone
Westerlies
doldrums
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