Answers2026-27 AL-Earth and Space ScienceStructure and Composition of the Atmosphere

Week 7: Structure and Composition of the Atmosphere Answers

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Which phrase describes air density?

A
increases as altitude increases
B
equals mass divided by volume
C
pushes molecules in one direction
D
exerts less pressure as it increases
2
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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
3

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.
4

Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
5

Which gas is most abundant in Earth’s atmosphere?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
6

Which word describes the amount of matter an object contains?

A
altitude
B
density
C
mass
D
pressure
7

Which gas in Earth’s atmosphere forms ozone?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
8

The image shows a representation of mountains of various heights, numbered 1, 2, and 3. The plain is labeled number 4.

Question illustration
A
1
B
2
C
3
D
4
9

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
10

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.

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