Chapter 9:
Ocean Water and Life
Practice Test
1.
In which direction do ocean currents rotate in the northern hemisphere?
a.
clockwise
b.
counterclockwise
c.
to the west
d.
to the east
Hint
2.
Select, from the following, marine organisms that move by drifting in ocean waters.
a.
nekton
b.
turtles
c.
sharks
d.
plankton
Hint
3.
Which of the following influences the density of seawater?
a.
plankton
b.
nekton
c.
waves
d.
salinity
Hint
4.
How do most ocean waves form?
a.
tides
b.
tsunamis
c.
earthquakes
d.
wind
Hint
5.
What are the forces that cause tides?
a.
winds blowing over long distances
b.
tidal waves
c.
gravitational attraction among the sun, Earth, and the moon
d.
tsunami waves
Hint
6.
How is salt removed from ocean water?
a.
All of these processes remove salt from seawater.
b.
by deposition of solid salts on the ocean bottom
c.
by animals forming hard parts
d.
by plants forming hard parts
Hint
7.
What is the origin of ocean water?
a.
an asteroid colliding with Earth
b.
an original dense atmosphere
c.
earthquakes
d.
volcanic activity
Hint
8.
What causes an upwelling?
a.
Warm water rises toward the surface of the ocean, killing plankton along the way.
b.
Cold water rises toward the surface of the ocean after warm water has been displaced by wind.
c.
High-salinity seawater rises toward the surface of the ocean.
d.
Thousands of fish begin to swim toward the surface of the ocean.
Hint
9.
Select the substance that is NOT a major component of salt in ocean water.
a.
sodium
b.
hydrogen
c.
sulfate
d.
chloride
Hint
10.
What causes most surface currents?
a.
heat from Earth's core
b.
deep ocean water temperature
c.
the Gulf Stream
d.
wind
Hint
11.
Why do waves break in shallow water?
a.
because of water moving in circles
b.
because of friction between the waves and the ocean floor
c.
because of warmer temperatures near the shore
d.
because of the tides coming in
Hint
12.
What best describes the motion of an object when a water wave passes by it?
a.
circular
b.
linear
c.
rapid
d.
downward
Hint
13.
What part of the flash desalination process first separates freshwater from salt water?
a.
collection
b.
condensation
c.
evaporation
d.
mixing
Hint
14.
Why is carbon dioxide needed to support life in the oceans?
a.
because fish ingest it as food
b.
because green algae need it to photosynthesize
c.
because sea animals breathe it in
d.
because it regulates ocean temperature
Hint
15.
Which of the following is a threat to life in the intertidal zone?
a.
washing out to sea
b.
all of these
c.
being consumed by birds
d.
drying up
Hint
