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Ocean Water
Test Description: Reviews importance of oceans, how they were formed, and the properties of ocean water
Instructions: Answer all questions to get your test result.
1) About how much of Earth's surface is covered by ocean water?
A
71%
B
50%
C
15%
D
30%
2) Which process on the early Earth first released most of the water that would eventually make the oceans?
A
erosion
B
photosynthesis
C
meteorite impacts
D
volcanic activity
3) Where does the salt in salty ocean water come from?
A
byproducts of ocean wildlife
B
the ocean floor
C
the atmosphere
D
rocks on land that are eroded by running water
4) What is the number one factor that determines the type of organisms that can live in a body of water?
A
salinity
B
density
C
temperature
D
amount of light
5) The earth's oceans contain about _______ percent salt.
A
0.35
B
35
C
3.5
D
0.5
6) How much salt is in freshwater?
A
about 3.5%
B
about 5%
C
less than 0.5%
D
about 35%
7) Where on Earth is ocean water the most dense?
A
near shorelines
B
surface water at the tropics
C
along the Gulf Stream
D
poles
8) How does salinity affect ocean water density?
A
Salinity has no influence on ocean water density because density is a fixed property of water.
B
Salinity affects the density of water only in very cold polar areas.
C
The more saline it is the more dense it is.
D
Highly saline water is less dense than water with no salt in it.
9) What type of water is most available for human use as drinking water?
A
ocean water
B
freshwater in rivers and streams
C
atmospheric water
D
ice and snow
10) How does ocean water temperature affect its movements?
A
Ocean water only moves once the temperature rises above 50 degees F.
B
Cold water rises
C
Cold water sinks
D
Warm water circulates and cold water stays still
*select an answer for all questions
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