Life and Earth's Crust — Unit test Answers

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21
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Without the greenhouse effect the Earth would be _______ than it is today.

A
warmer
B
drier
C
colder
D
wetter
22
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Human activities _______.

A
exacerbate the natural greenhouse effect
B
create the greenhouse effect
C
diminish the greenhouse effect
D
eliminate the greenhouse effect
23

Climate warming trends allow plant and insect species to inhabit larger ranges.

A
T
B
F
24

Depletion to the ozone layer can cause changes to the biogeochemical cycles.

A
T
B
F
25

Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?

A
Pollution began reflecting sunlight and heat rather than absorbing it.
B
Evidence of global warming became overwhelming.
C
Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.
D
Congress required scientists to assign a cause to global climate change.

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