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9 Cards in this Set
- Front
- Back
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Continental drift- the continents has moved.
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Pangaea- when the continents was one land, formed into one giant continent.
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Panthalassa- a huge ocean. Which was one big ocean that surrounded Pangaea.
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Measosaurus- A small, extinct land reptile that lived 270 million years ago, had already been found in both eastern South America and western Africa.
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Mid-Atlantic Ridge- An undersea mountain range with s steep, narrow valley running down it center. A part of mid-ocean ridges.
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Mid-Ocean Ridges- 65,000 km long that wind their way around the earth. None of the rocks were more than 150 million years old.
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Seafloor spreading- as the ocean floor was moving away from the ridge, it was replaced by rising magma that cooled and solidified onto new rock.
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Plate tectonics- describes the continental movement but also proposes a possible explanation of why and how continents move.
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Oceanic crust- materials on the ocean floor forms oceanic crust.
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Continental crust- Makes up the continental landmass.
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Lithosphere- Makes up the upper mantle which is oceanic and continental crust and the rigid.
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Asthenosphere- Layer of plastic rock, that is, solid rock that slowly flows when under pressure. Outer shell of the earth and beneath the lithosphere.
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Divergent Boundary- Two plates moving away from each other forms this.
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Rift Valley- In the center of a mid-Atlantic is a narrow valley formed as the plates separate.
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Convergent Boundary- formed by a collision of one plate with another type of plate boundary.
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Subduction zone- A deep ocean trench forms this.
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Island arc- Part of subducted plate melts, and the molten rocks rises to the surfaces.
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Transform fault boundary- forms where two plates are grinding past each other.
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