Earth Science: Geology, the Environment, and the Universe

Section 2: The Seafloor

The Seafloor

1
According to the graph, at what depth does the sea floor start to drop off?
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A)2 km
B)1 km
C)4 km
D)8 km
2
How are fjords formed?
A)global cooling
B)sea level rise
C)tectonic forces
D)longshore current
3
What is the shallowest part of the continental margin called?
A)the continental rise
B)the continental shelf
C)the shelf break
D)a submarine canyon
4
How are submarine canyons formed?
A)turbidity currents
B)rivers
C)runoff
D)longshore current
5
__________ are submerged basaltic volcanoes more than 1 km high.
A)Seamounts
B)Shelf breaks
C)Submarine canyons
D)Fracture zones
6
According to the graph, what is the approximate depth range of ocean basins?
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A)1 km to 4 km
B)2 km to 4 km
C)6 km to 8 km
D)8 km to 10 km
7
How deep is the deepest place in the ocean?
A)2 km
B)11 km
C)100 km
D)20 km
8
What breaks mid-ocean ridges into smaller sections?
A)fracture zones
B)submarine canyons
C)shelf breaks
D)abyssal plains
9
According to the table, what happens to the water temperature as depth increases?
Ocean depth (m)100200300400500600700800900100011001200
Water temperature ( °C)232323155.555554.54.54

A)It decreases.
B)It remains constant.
C)It increases.
D)It fluctuates.
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