Chapter 12:
The Ocean Floor and Shore Zones
Practice Test
1.
On a flat shore zone, if you were to walk from the beach toward the open ocean, what is the first major ocean-floor feature that you would encounter?
a.
continental shelf
b.
abyssal plain
c.
ocean trench
d.
continental slope
Hint
2.
Which of the following is NOT a negative effect of human-introduced pollution in the shore zone?
a.
introduction of toxic insecticides and herbicides
b.
disruption of food chains
c.
cleanup of oil spills
d.
reduction of oxygen supplies
Hint
3.
Where does most beach sand originate?
a.
Ocean waves carry sediment from offshore to the beach.
b.
The deepest ocean waters carry sand toward shore.
c.
Rivers carry sediment from land to sea.
d.
Currents carry sand from the updrift side of gronynes.
Hint
4.
Along which type of shore zone may one find narrow beaches and violent wave action?
a.
steep shore zones
b.
drift shore zones
c.
groyne shore zones
d.
flat shore zones
Hint
5.
Sonar is an important, indirect method for studying ocean-floor features. How does sonar work?
a.
Weighted ropes are lowered to the ocean bottom.
b.
Alvin descends to the bottom and collects seafloor rocks.
c.
Sound waves are sent to the ocean floor and reflect back to the ship.
d.
Robots are sent to photograph features.
Hint
6.
Beaches are composed of which types of materials?
a.
small stones and powder-sized grains
b.
sand-sized mineral grains
c.
Sound waves are sent to the ocean floor and reflect back to the ship.
d.
all of the above
Hint
7.
Most ocean waves strike shore at an angle, which causes movement of water and sand parallel to shore. What is this movement of water and sand known as?
a.
longshore current
b.
wave current
c.
breaker current
d.
angular current
Hint
8.
Where does volcanic activity occur on the ocean floor?
a.
on continental slopes
b.
along rift zones in mid-ocean ridges
c.
on continental shelves
d.
in trenches
Hint
9.
What types of mineral deposits are present at rift zones that may be mined during the twenty-first century?
a.
granite
b.
precious metals
c.
gems
d.
halite
Hint
10.
How have humans traveled to the ocean floor?
a.
submersibles
b.
sonar
c.
gems
d.
none of the above
Hint
11.
Which is an example of a volcanic mountain that has been built up from the bottom of the seafloor?
a.
California
b.
Mount Shasta
c.
Hawaii
d.
Mount Everest
Hint
12.
How do living things make food along ocean rift zones, which are about 2500 m below the ocean surface?
a.
through chemosynthesis
b.
through photosynthesis
c.
through synthesis of green plants
d.
through synthesis of bacteria
Hint
13.
Which of the following statements is true of beaches?
a.
They are subject to change by waves, tides, currents, and winds.
b.
They are permanent.
c.
They all contain shell fragments.
d.
They are featureless.
Hint
14.
What could cause an oil spill?
a.
collisions involving oil tankers
b.
accidents at oil refineries
c.
leaking offshore oil wells
d.
all of the above
Hint
15.
What happens when a current carrying sand hits an obstacle, such as a groyne?
a.
The current speeds up on the updrift side.
b.
The groyne is eroded on the updrift side.
c.
The current transfers its energy to the groyne and drops its load of sand on the updrift side.
d.
The current remains unchanged.
Hint
