Drift and Boundaries
By Erin Smoak
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Last updated about 4 years ago
39 Questions
Note from the author:
This one is about Alfred Wegener's theory of continental drift, seafloor spreading, and plate tectonics.
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1.
Who first proposed the theory of continental drift?
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2.
What year did Wegener publish his book?
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3.
What was Wegener's theory called?
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4.
What did Wegener's book have in it?
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5.
What were Wegner's 3 lines of evidence?
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6.
What were 2 of the fossils that Wegener used as part of his evidence?
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7.
What 2 places did they find tropical plant fossils that are currently covered in ice?
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8.
What did Wegener find in South Africa? (Read the whole page)
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9.
What kind of rock was in both North America and Scotland?
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10.
What did Wegener name the supercontinent?
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11.
What was the main reason that most scientists rejected Wegener's hypothesis?
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12.
When was this theory revisited?
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13.
What caused scientisit to revisit continental drift?
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14.
What did sonar find on the ocean bottom?
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15.
All are evidence to support the theory of continental drift EXCEPT
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16.
What new technology did scientists use to map the bathymetry of the ocean floor?
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17.
Magnetic stripes are ____________ on either side of the mid ocean ridge.
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18.
Rocks on the sea-floor that lie in a pattern, show a record of the reversals of
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19.
What new technology did scientists use to find changes on either side of the mid-ocean ridge?
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20.
Where is the youngest seafloor?
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21.
Sea-floor spreads apart at both sides of a _____ as new crust is added.
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22.
Drilling samples revealed that rock samples taken farther from a mid-ocean ridge are
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23.
What new information led to the expanding earth theory?
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24.
When continental plates collide what landform is made?
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25.
Which type of plates go under other plates?
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26.
What mixes with rock to melt it?
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27.
What causes the volcanoes on the ring of fire?
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28.
What is the example of a transform fault (where plates slide past each other)?
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29.
How long has the earth's surface been shifting?
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30.
How many major plates are on Earth?
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31.
How hot is the mantle?
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32.
Why is part of the mantle solid?
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33.
Which layer of the earth is under the most pressure?
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34.
What is the temperature-propelled motion in the mantle called?
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35.
Where are the 2 extra hot regions of the mantle?
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36.
How long does it take for the oldest, coolest parts of the crust to sink back into the mantle?
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37.
How fast do plates move?
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38.
What was the name of the giant landmass about 250 million years ago?
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39.
What is the theory about crust moving called today?