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Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?

A
water vapor
B
methane
C
fluorinated gas
D
carbon dioxide
23
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What occurs when the Northern Hemisphere experiences spring and the Southern Hemisphere experiences fall?

A
The Sun is directly overhead in the Northern Hemisphere.
B
The Southern Hemisphere receives more direct rays from the Sun.
C
The Northern and Southern Hemispheres get the same amount of energy from the Sun.
D
The Northern Hemisphere receives more daylight hours than the Southern Hemisphere.
24

Which is one factor that adds to the greenhouse effect?

A
a decrease in the amount of dust in the atmosphere
B
a decrease in the amount of water on Earth’s surface
C
an increase in gases in the atmosphere that absorb heat
D
an increase in the amount of solar radiation that reflects into space
25

Which statement describes seismic waves?

A
They carry energy.
B
They move in one direction.
C
They originate from the epicenter.
D
They only vibrate at Earth’s surface.

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