Section #: 16.2
The Seafloor
Practice Test
1.
According to the graph, what is the approximate depth range of ocean basins?
a.
1 km to 4 km
b.
2 km to 4 km
c.
6 km to 8 km
d.
8 km to 10 km
Hint
2.
What is the shallowest part of the continental margin called?
a.
a submarine canyon
b.
the continental shelf
c.
the continental rise
d.
the shelf break
Hint
3.
According to the graph, at what depth does the sea floor start to drop off?
a.
1 km
b.
2 km
c.
4 km
d.
8 km
Hint
4.
How are fjords formed?
a.
longshore current
b.
global cooling
c.
tectonic forces
d.
sea level rise
Hint
5.
How are submarine canyons formed?
a.
runoff
b.
longshore current
c.
turbidity currents
d.
rivers
Hint
6.
__________ are submerged basaltic volcanoes more than 1 km high.
a.
Submarine canyons
b.
Shelf breaks
c.
Seamounts
d.
Fracture zones
Hint
7.
According to the table, what happens to the water temperature as depth increases?
Ocean depth (m)
100
200
300
400
500
600
700
800
900
1000
1100
1200
Water temperature (°C)
23
23
23
15
5.5
5
5
5
5
4.5
4.5
4
a.
It increases.
b.
It decreases.
c.
It remains constant.
d.
It fluctuates.
Hint
8.
How deep is the deepest place in the ocean?
a.
2 km
b.
11 km
c.
20 km
d.
100 km
Hint
9.
What breaks mid-ocean ridges into smaller sections?
a.
abyssal plains
b.
shelf breaks
c.
fracture zones
d.
submarine canyons
Hint
