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10 Cards in this Set
- Front
- Back
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continental drift
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hypothesis that states the continents had moved
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Pangaea
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all land one single land mass
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Panthalassa
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all sea it surrounded Pangaea
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normal polarity
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magnetic minerals in newly formed rock orient toward magnetic north
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reverse polarity
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magnetic minerals in newly formed rock orient toward magnetic south
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Mid-Atlantic Ridge
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an undersea mountain range with a steep , narrow valley running down the center is part of and 80,000 km system of mid-ocean ridges that wind their way around the earth.
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mid-ocean ridges
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system of underwater ridges that wind their way around the earth.
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plate tectonics
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describes continental movement and is a possible explanation of why and how continents move
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divergent boundaries
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plate move apart an the asthenosphere flows upward to fill the open space. this creates mid ocean ridges or rift valleys
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convergent boundaries
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when plate boundaries collide. It can be ocean - ocean (makes ocean trench and island acres), ocean- continent (ocean is subducted ), continent
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