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Unit 3 Review 1
Test Description: Describe the Earth system and the 5 spheres.
Instructions: Answer all questions to get your test result.
1) Earth has both freshwater and salt water. About how much of Earth’s water is fresh water?
A
15%
B
67%
C
3%
D
97%
2) Each layer of the geosphere has mass. Which layer has the most mass?
A
the ocean
B
the mantle
C
the crust
D
the core
3) Sometimes fires burn down large areas of forests that are part of the biosphere. Other than the biosphere, which of Earth’s other spheres is a forest fire most likely to affect?
A
cryosphere
B
atmosphere
C
hydrosphere
D
geosphere
4) What is the order of the layers of the geosphere when starting from Earth’s center and moving outward?
A
atmosphere, crust, mantle
B
core, crust, mantle
C
core, mantle, crust
D
mantle, core, atmosphere
5) About how many times more nitrogen than oxygen is in the air?
A
about 8 times more
B
about 6 times more
C
about 4 times more
D
about 2 times more
6) Surface currents and waves form when energy from the sun causes two of Earth’s spheres to interact. Which two spheres interact to produce these waves and currents?
A
the atmosphere and hydrosphere
B
the cryosphere and atmosphere
C
the biosphere and hydrosphere
D
the geosphere and biosphere
7) At different places on Earth, depending on elevation, air pressure varies. What causes atmospheric pressure?
A
density of nitrogen
B
the sun's heat and light
C
weight of air
D
Earth's magnetic field
8) As altitude increases, what happens to the pressure of the air?
A
The air pressure decreases
B
The air pressure stays the same
C
The air pressure increases at first, then stays the same
D
The air pressure increases.
9) Earth scientists have identified four distinct layers of the atmosphere. What is the correct order of these layers from lowest to highest?
A
thermosphere, mesosphere, stratosphere, troposphere
B
troposphere, mesosphere, thermosphere, stratosphere
C
troposphere, stratosphere, mesosphere, thermosphere
D
stratosphere, troposphere, mesosphere, thermosphere
10) Much of the ultraviolet radiation from the Sun is absorbed in the upper atmosphere. Which molecule is responsible for this?
A
nitrogen
B
hydrogen
C
ozone
D
carbon dioxide
*select an answer for all questions
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