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Chapter 4 Continental Drift and Plate Tectonics
Terms in this set (14)
What is continental drift?
This is the predecessor for plate tectonics where the continents seem to move
Who proposed that the continents once fit together?
How did Alfred Wegener defend that the continents once fit together and what book did her write?
1. Rock in the southern hemisphere showed signs of glaciation
2. Found fossil remains of an organism that thrives in a different environment where it could not thrive now
3. Mountain ranges in greenland, scandinavia, tthe british isles, the east coast of NA and NW africa correlated well
4. East coast of south america and africa fit nicely
What are the problems that occur where NA, SA and Europe don't match the continental drift theory?
1. Iberian peninsula (spain and portugal) must be moved slightly
2. There is overlap where iceland (it has recently been created)
What did Wegener call this big land mass?
What was the Northern part of pangea called when it split up and what 2 continents did it include?
Laurasia, North America and Europe
What was the Southern part of pangea called when it split up and what 2 continents did it include?
Gondwanaland, South America and Africa
How did Wegener propose the continents moved?
That the continents plowed through the ocean crust by centrifugal force and gravitational forces by the sun and moon
How do the plates move?
Relative to the magnetic pole
What do basalt have to do with the movement of the continents?
Basalts contain a lot of iron which act magnetically
The molten basaltic magma cools and the Earth endows the rock
How is possible to find the location of the north pole with basalt?
Measuring the magnetic field in the basalt at the time it was formed
What do older and younger basalts show?
Younger: from other continents show closer agreement on the position of the north pole
Older: from other continents show a gradual divergence in the position of the north pole
How does the behavior of terrestrial magnetism support plate tectonics?
Through the phenomenon of of magnetic reversal
Describe the magnetic reversal.
Rock basalts indicate the location of the north pole. The north pole is located in the arctic circle but some older basalts indicate that it was in the antarctic continent
THIS SET IS OFTEN IN FOLDERS WITH...
Geology Exam 1
Geology: Chapter 16
Geology Chapter 19
Geology Chapter 18
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