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Continental Drift and Seafloor Spreading
Continental Drift and Seafloor Spreading
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Continental drift and seafloor spreading, including Wegener and Hess; quiz prep
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1
Alfred Wegener said Pangaea broke apart about _______________ .
3.0 million years ago
300 million years ago
300 years ago
300,000 years ago
2
What two continents fit together most noticeably and were evidence for the original theory?
Africa and North America
Antarctica and Africa
South America and Europed
South America and Africa
3
Land feature that happens when there is subduction is called a ____
asthenosphere
mid-ocean ridge
deep-ocean trench
4
True or False? Sea-floor spreading takes place in a lake.
True
False
5
What causes the crust to move?
tension
convection
radiation
concudction
6
Which 2 continents have mountain ranges with similar rock & structure, used as evidence of CD?
Australia and India
North America and Russia
South America and India
Africa and South America
7
New crust is always formed at the ____
deep-ocean trench
mid-ocean ridge
asthenosphere
8
The
oldest
seafloor is located _____?
closest to the mid-ocean ridge
farthest from the mid-ocean ridge
9
What is sonar?
A device used by scientists to map seafloor spreading.
A device that is used to create mid-ocean ridges.
A device used by scientists to map mid-ocean ridges.
10
What was the name given to the "super continent"?
Pangaea
Laurasia
Papua New Guinnea
Gondwana
11
In sea-floor spreading, where does the new crust come from?
It comes the sun.
It comes from solid material.
It comes from glaciers.
It comes from molten material.
12
When one tectonic plate _____ under another and sinks back into the mantle.
falls
rises
subducts
13
True or False? The Pacific Ocean is shrinking.
False
True
14
Magma, or molten material, ____ and hardens.
warms
cools
shrinks
15
A freshwater reptile fossil found by Wegener was called ________________.
Glossopteris
Reptosaraus
Tyranosaurus
Mesosaurus
16
Wegener could not explain ____________________.
what made the continents move
the size of the continents
how oceans were created
how climates changed
17
The fern-like plant fossil Wegener discovered was called ________________
Cynognathus
Glossopteris
Mesosaurus
Lystrosaurus
18
What do the lines in our model stand for?
A line
sonar readings
magnetic stripes
longitude and latitude
19
What evidence helps scientists show how sea floor spreading occurs?
magnetic stripes
ocean floor material
all of the above
drilling samples
20
The process by which molten material adds new oceanic crust to the ocean floor is called?
The seafloor cracking apart
Seafloor Spreading
ocean growing
Deep Ocean trenching
21
What happens when subduction occurs?
parts of the crust fall into the core
parts of the crust fall into space
parts of the crust fall into the mantle
none of the above
22
Which is
NOT
evidence of sea-floor spreading?
drilling samples of rock
molten magma constantly erupting
fossil evidence
magnetic stripes
23
Who proposed the theory of sea-floor spreading?
H. Hess
H. Alfred
H. Howard
A. Wegener
24
What are mid-ocean ridges?
a chain of underwater volcanoes
a chain of underwater waterfalls
a chain of underwater rocks
a chain of underwater mountains
25
Sea-floor spreading begins at the___.
mid-ocean ridge
deep ocean trench
continent's edge
26
The process which more dense crust sinks beneath less dense crust and band back into the mantle
sea-floor spreading
subduction
mid-ocean ridge
27
Who is the person credited with developing the theory of continental drift?
C. Drift
H. Hess
A. Wegener
A. Einstein
28
Coal fields in ______________ and ____________ match up.
Europe and North America
Africa and Australia
North America and South America
Europe and Africa
