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