AnswersSS4 PGCPS EARTH SPACE OC SUMMER 2027 - 794243Structure and Composition of the Atmosphere

Structure and Composition of the Atmosphere Answers

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3

As altitude increases, what happens to air pressure?

A
It fluctuates.
B
It increases.
C
It decreases.
D
It stays the same.
4

Which gas is most abundant in Earth’s atmosphere?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide
5

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
7

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
8

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
9

Which gas in Earth’s atmosphere forms ozone?

A
oxygen
B
nitrogen
C
water vapor
D
carbon dioxide

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