Earth Science: Geology, the Environment, and the Universe

Section 3: Air Resources

Air Resources

1
Oxygen makes up __________ percent of Earth's air.
A)73
B)12
C)80
D)21
2
How is oxygen released into Earth's atmosphere?
A)burning fossil fuels
B)photosynthetic plants
C)volcanic eruptions
D)burning forests
3
What part of this township shown in the map can negatively impact the air resources?
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A)gravel pit
B)woods
C)river
D)highway
4
Oxygen __________.
A)has not always been a part of Earth's atmosphere
B)has been in Earth's atmosphere for the past 4.6 billion years
C)is released by volcanic eruptions in large quantities
D)was used up by early life-forms during photosynthesis
5
What is an example of natural air pollution?
A)acid precipitation
B)smoke from forest fires
C)carbon monoxide from engine exhaust
D)dust from desertification
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