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19 Cards in this Set
- Front
- Back
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The earth is in constant motion. |
True
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Describe 3 motions of plate tectonics
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Pushing together.
Pulling apart. Sliding side by side. |
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What's a tectonic plate?
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A rigid moving piece of lithosphere.
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How many tectonic plates are there?
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7 major
Many minor |
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What are the 3 types of plate boundaries? |
Convergent |
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What are oceanic plates?
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Plates mostly consists of water.
If the edges of 2 plates are oceanic. |
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What do oceanic plates form? |
Deep ocean trenches.
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What happens when oceanic plates meet continental plates?
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The oceanic plate subducts.
Tsunamis, volcanic arcs, deep focus earthquakes. |
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What happens when 2 continental plates meet?
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Neither subducts.
Forms mountains, large mountain belts, earthquakes, some volcanism |
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What are divergent plate boundaries?
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Pulling away.
Oceanic rifts. (Valley in ocean floor) Ridges on both sides of rift. Weak earthquakes. |
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What plates meet at convergent subduction boundaries?
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Oceanic plates and continental plates (where the oceanic plate subducts)
Or 2 oceanic plates (where the older ocean floor subducts) |
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What plates meet at convergent collision plates?
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2 continental plates that don't subduct
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Crust is being created and destroyed at boundaries
True or false. |
True.
Destroyed: convergent subduction boundaries Created: divergent boundaries |
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Continents are stationary. |
False. Continents move over time.
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When and who presented the idea of continental drift? |
Alfred Wegener, 1912 |
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What is Wegener suggesting? |
That the supercontinent Pangaea broke up and drifted into their current positions.
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Who is Alfred Wegener? |
A meterologist, a planetary scientist, suggested continental drift.
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Name 4 pieces of evidence that supports continental drift
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- Jigsaw fit of continents
- Fossils that fit - Geologic structures such as mountain belts - Ancient Climates (ice ages) |
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Why was Wegener's theory not accepted?
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Because the theory lacked a driving mechanism.
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