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Structure and Composition of the Atmosphere Answers

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Which gas is most abundant in Earth’s atmosphere?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
2
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Which correctly lists three characteristics that are used to describe air?

A
altitude, density, radiation
B
density, radiation, mass
C
mass, pressure, density
D
pressure, altitude, radiation
3

Which phrase describes density?

A
height of a point above sea level
B
force pushing on an area or a surface
C
amount of mass in a certain volume
D
amount of matter an object contains
5

As altitude increases, what happens to air pressure?

A
It fluctuates.
B
It increases.
C
It decreases.
D
It stays the same.
7

Joe, a hiker, stands at the top of a hill on a trail above the ocean. Joe's friend Dave is just starting out at the trailhead, which is at the beach.Which statement about this scenario is accurate?

A
The air Joe is breathing is denser than the air at sea level.
B
The air pressure is higher where Joe is than where Dave is.
C
If Joe keeps going up, air pressure will continue to decrease.
D
The air Joe is breathing is denser than the air Dave is breathing.
8

Which describes one of oxygen's roles in Earth’s atmosphere?

A
allows fuels to burn
B
forms clouds that produce rain
C
is the gas that animals exhale
D
is used by plants to produce food
9

Which characteristic describes the troposphere?

A
contains the ozone layer
B
has the highest air pressure
C
spans 12–50 km above Earth
D
is a good place for planes to fly
10

Which is one way that Earth’s atmosphere supports life?

A
It filters out oxygen.
B
It keeps Earth warm.
C
It increases UV radiation.
D
It provides a solid shield.

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