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16 Cards in this Set
- Front
- Back
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who discovered that continents fit together?
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Alfred Wegner
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how could they tell that the continents went together besides continental drift?
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the rocks matched/same fossils/ animals were similar on sides that fit
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what is a Divergent fault
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mid oceanic ridge/ lava comes out goes on sides.
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what is a transform fault?
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when two plates slide against eachother
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what is a convergant fault?
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oc-oc
oc-cc cc-cc |
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what happens when there is an c.c to o.c.?
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water vapor and other gasses lower melting point of magma/ water remains liquid/ pressure is released/explosion
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what happens when o.c. to o.c.?
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the more dense plate goes down, creates a trench, makes volcano and magma layers go above sea level creates island
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What happens when c.c. to c.c.?
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crash together/earthquake/mountains created
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how/where is new ocean crust formed?
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mid-oceanic ridge/ under water volcano erupts, pushes away old crust for new crust to form
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what happends to old crust?
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as the crust hardems it cold and becomes more dense, crashes with other o.c. makes a subduction zone and the more dense plate goes down.
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what does the daa on earthquake depth tell us about the motion of the crust?
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how far down the lower plate is going after the collision
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What did Submarine Warfare promote?
When did this happen? |
the mapping of the ocean floor (1945)
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What did seimograph data from explosions reveal?
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the ocean crust was much thinner than continental crust
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What is dredging? when was it invented?
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when a sack was slided across the ocean floor to pick up rocks (1950's)
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What did dgredging reveal?
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volcanic rock with magnetic properties
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What did paleomagnetometry reveal?
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pattern of magnetic distortions along ocean ridge
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