Chapter 9 Quiz

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10 terms

d. 71%

1. What percentage of Earth's surface is covered by oceans
and marginal seas?

a. 29%
b. 43%
c. 67%
d. 71%
e. 82%

a. salinity

2. The proportion of dissolved salts to pure water in the
ocean is called _________.

a. salinity
b. chlorinity
c. chemistry
d. halinity
e. fetch

b. thermocline

3. The layer of rapid temperature change below the ocean
surface is the ____________.

a. halocline
b. thermocline
c. slope
d. thermohaline
e. thermal

e. sound

4. Using an echo sounder, scientists can determine the
depth of water by measuring the time it takes for ______ to reflect off the ocean floor.

a. light
b. radio waves
c. tsunamis
d. microwaves
e. sound

b. False

5. High surface salinities are found in the subtropics because of the excessive precipitation that occurs in these regions.

a. True
b. False

b. abyssal plains

6. These ocean basin floor features are among the most level places on Earth.

a. seamounts
b. abyssal plains
c. continental slopes
d. deep-ocean trenches
e. mid-ocean ridges

c. deep-ocean trenches

7. The sites where moving plates plunge back into the mantle are ____________.

a. seamounts
b. abyssal plains
c. deep-ocean trenches
d. continental slopes
e. mid-ocean ridges

a. seamounts

8. Isolated volcanic peaks found on the ocean floor are called _______.

a. seamounts
b. abyssal plains
c. continental slopes
d. deep-ocean trenches
e. mid-ocean ridges

b. climate

9. Sediments from the ocean floor are useful in analyzing
Earth's _________ history.

a. population
b. climate
c. industrial
d. precambrian
e. recorded

b. False

10. The most abundant salt dissolved in the seawater is sodium sulfate.

a. True b. False

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