Which process or processes change the size and shape of the oceans?

both subduction and sea-floor spreading

any trace of an organism that has been preserved in rock

What was Alfred Wegener's hypothesis?

The continents are slowly moving over Earth's surface.

What is happening at mid-ocean ridges?

plates are moving away from each other and magma seeps out

What are mid-ocean ridges?

long chains of mountains that rise up from the sea floor

Why does subduction occur?

more dense crust sinks under less dense crust

What is a deep-ocean trench?

a deep underwater canyon formed by subduction

Which of the following is true about the Atlantic Ocean?

The Atlantic Ocean is expanding, The ocean floor int he Atlantic is attached to continents, There are few trenches in the Atlantic Ocean

Why was "continental drift" rejected during Wegener's lifetime?

Wegener could not explain how the continents had moved

Which of the following is NOT used as evidence for the existence of the supercontinent Pangaea?

Shark fossils were found in Antarctica

Which of the following is NOT a reason why the Pacific Ocean is getting smaller?

There is no mid-ocean ridge in the Pacific Ocean

How the use of sonar help Marie Tharp map the ocean floor?

sound waves were used to measure the distance to an object

the process in which the crust sinks back into the mantle

What is seafloor spreading?

a process in which new material is added to oceanic crust

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Continental Drift and Seafloor Spreading

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Introduction to Plate Tectonics

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Answers

1
Which process or processes change the size and shape of the oceans?
both subduction and sea-floor spreading
both drilling for samples and subduction
sea-floor spreading only
subduction only
2
What is a fossil?
a type of extrusive igneous rock
the hard parts of an animal that take longer to decay
a type of metamorphic rock
any trace of an organism that has been preserved in rock
3
Where does subduction occur?
the central valley of a mid-ocean ridge
on continents
at a deep ocean trench
mid-ocean ridges
4
What was Alfred Wegener's hypothesis?
The continents have always been in the same spot.
The continents are fixed in one point.
The continents are quickly moving over Earth's surface
The continents are slowly moving over Earth's surface.
5
What is happening at mid-ocean ridges?
plates are moving away from each other and magma seeps out
plates are moving towards each other and pushing up
sea creatures are skiing down them
we still don't know
6
The farther from a mid-ocean ridge a rock sample is taken, the __ the rock is.
same age
older
younger
youngest
7
What are mid-ocean ridges?
areas where crust pushes together
long chains of mountains that rise up from the sea floor
baseball seams
areas where crust bends into the mantle
8
Why does subduction occur?
less dense crust sinks under more dense crust
less dense crust sinks under less dense crust
more dense crust sinks under less dense crust
more dense crust sinks under more dense crust
9
What is a deep-ocean trench?
a section of the mantle
an underwater mountain formed by lava flow
a deep underwater canyon formed by subduction
ridges on the seafloor
10
Which of the following is true about the Atlantic Ocean?
The Atlantic Ocean is expanding
The ocean floor int he Atlantic is attached to continents
There are few trenches in the Atlantic Ocean
The Atlantic Ocean is shrinking
11
Why was "continental drift" rejected during Wegener's lifetime?
Wegener could not explain how the continents had moved
Wegener could not explain the Lystrosaurus.
Wegener could not explain the Mesosaurus.
Wegener had no evidence for his hypothesis.
12
Which of the following is NOT used as evidence for the existence of the supercontinent Pangaea?
Glossopertis fossils found across three continents
Glacial scratches on rocks in South Africa
Shark fossils were found in Antarctica
Folded mountains on coastlines
13
Which of the following is NOT a reason why the Pacific Ocean is getting smaller?
crust is being added slower than it is being subducted
crust is subducted at the trenches in the Pacific Ocean
There is no mid-ocean ridge in the Pacific Ocean
the Pacific Ocean is surrounded by many trenches
14
How the use of sonar help Marie Tharp map the ocean floor?
submarines took pictures
anchors were dropped off of ships to measure distance
sound waves were used to detect sea creature movement
sound waves were used to measure the distance to an object
15
What is subduction?
The process in which the mantle sinks back into the crust
the process in which the crust rises above the mantle
the process in which the mantle rises above the crust
the process in which the crust sinks back into the mantle
16
What is seafloor spreading?
a process in which the seafloor thins out
a process in which new material is added to oceanic crust
a process in which the seafloor stops moving
a process in which crust bends into the mantle
17
What was Alfred Wegener's idea that the continents were slowly moving over the Earth called?
Continental Drift
Pangaea
Continental Movement
Drifting Land

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