Earth Science Geology, the Environment, and the Universe

Chapter 15: Earth's Ocean

Multiple Choice Quiz

1
During relatively warm times of Earth's geologic history, the volume of glacial ice was __________ and sea level was __________.
A)high, high
B)low, high
C)low, low
D)high, low
2
In the graph, what is the sharp drop in temperature from about 20°C to about 7 °C called?
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A)the temperaturcline
B)the trophocline
C)the thermocline
D)the tomocline
3
The density of seawater is dependent on _________
A)salinity and temperature
B)temperature and currents
C)salinity only
D)temperature only
4
The salinity of seawater is __________ over geologic time.
A)increasing
B)decreasing
C)constant
D)always changing
5
The velocity of sound in water is __________.
A)1454 m/s
B)1,000,000 m/s
C)140 m/s
D)4500 m/s
6
Today, water vapor that is added to Earth's atmosphere is destroyed by __________.
A)the ozone hole
B)X rays
C)ultraviolet radiation
D)the greenhouse effect
7
What are wind-driven currents called?
A)spring tides
B)density currents
C)surface currents
D)ocean currents
8
What determines the speed of waves in deep water?
A)wave height
B)direction of waves
C)wavelength
D)surface currents
9
What do the circles in the figure represent?
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A)bubbles
B)water movement
C)wavelength
D)heat energy
10
What geologic process released large amounts of water vapor into Earth's early atmosphere?
A)precipitation as ice, water, or snow
B)melting of glacial ice
C)movement of ocean currents
D)volcanic eruptions
11
What is one source of sodium ions found in the ocean?
A)the shells of marine organisms
B)volcanic gases
C)ultraviolet radiation
D)evaporation
12
What is the difference between low and high tide called?
A)tidal range
B)neap tide
C)full moon
D)riptide
13
What is the source of cold water of Earth's oceans?
A)equatorial seas
B)polar seas
C)years with long winters
D)years with cold temperatures
14
What layer is shown right above the thermocline (around 1000 meters deep) in the graph?
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A)surface layer
B)top layer
C)thermal layer
D)bottom layer
15
What type of technology is used to map the ocean floor?
A)GPS
B)submarines
C)sonar
D)UV radiation
16
Why are salinities lower than average in some areas close to the equator?
A)rapid evaporation
B)abundant precipitation
C)larger clouds
D)stronger winds
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