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Sea Floor Review

Total questions: 18

Worksheet time: 9mins

Name
Class
Date
1.
The oceanic crust _________ when it reaches the continental crust.
a)
sinks
b)
rises
c)
expands
2.
The process that happens at the deep-ocean trench is called...
a)
sea-floor spreading
b)
adding material to the ocean floor
c)
subduction
3.
The land feature that happens when there is subduction is called a...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
4.

Where do passive margins occur?

a)

Where continents and seafloor are part of the same tectonic plate

b)

Where the mid ocean ridge is

c)

At subduction zones

d)

On deep ocean basins

5.
Older crust is found towards the...
a)
Mid-ocean ridge
b)
Deep-ocean trench
c)
Asthenosphere
6.

Sea-floor spreading begins at the

a)

Deep ocean trench

b)

Mid-ocean ridge

c)

Continent's edge

7.

The flat area of the ocean basin is called the

a)

Abyssal main

b)

Plain

c)

Abyssal plain

d)

Abyssal pain

8.
Where is the deepest place in the ocean
a)
Middle of Pacific Ocean
b)
middle of Atlantic Ocean
c)
Marianas Trench
d)
Macaroni Trench
9.
New crust is always formed at the...
a)
mid-ocean ridge
b)
deep-ocean trench
c)
asthenosphere
10.
which margin would have the most earthquakes?
a)
passive
b)
active
c)
wactive
11.
What did scientists use to map the oceans floor?
a)
Echo-location
b)
Sonar
c)
Space Shuttles
d)
Animals
12.

Bathymetry is the study of

a)

submarine volcanoes

b)

plate tectonics

c)

sea water

d)

ocean contours

13.

A fathom is equal to

a)

3 ft

b)

6 ft

c)

2 m

d)

6m

14.
A wide flat area that takes up about 40% of the ocean floor.
a)
Continental Shelf
b)
Mid-Ocean Ridge
c)
Trench
d)
Abyssal Plains
15.
Two tectonic plates collide at a ___ plate boundary.
a)
convergent
b)
divergent
c)
transform
d)
transformer
16.

Where do island arcs occur?

a)

at the mid-ocean ridge

b)

along subduction zones, parallel to the edges of ocean trenches

c)

along passive continental margins

d)

in the center of abyssal plains

17.

What are black smokers?

a)

The fastest known species of squid

b)

Hydrothermal vents

c)

Another name for the Aleutian Islands

d)

A species of tube worms

18.
An underwater volcano is called what?
a)
Seamount
b)
Ocean Volcano
c)
Exploding Earth
d)
Seacano