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13 Cards in this Set
- Front
- Back
converging plate boundary (Subduction zone) moves in what direction- describe |
pushing together. Lithosphere goes under other lithosphere (ontop, rigid mountains) Athemosphere below |
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Draw a converging plate boundary (collision zone_ |
pushing together. Lithosphere goes slightly under other lithospgere (rigid mountains in center) athemosphere below) |
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Draw a diverging plate boundary |
Moving away from each other |
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Draw a transform fault boundary |
Moving In different directions (rubbing against each other |
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first evidencesthat suggest pangaea (4) |
continents fit together like a jigsaw (South America/Africa Similar plant/animal fossils on both contenets Similarly aged/structure mountains Ice sheets covered warm locations suggest continents were closer to south pole once |
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when did pangea drift apart |
200 million ya |
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what is plate tectonics |
first theory that supported pangaea. core causes convection currents, shifting 2- plates that make up shell Unequal distribution of heat in core causes convection currents |
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why did scientists disagree with wegeners theory |
no explanation for how they moved |
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how many plates is earths outer shell made up |
20 of oceanic/continental crust. float on mantle. |
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why are plate boundaries prone to collision |
convection currents moves plats. |
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how are ridges formed |
convection current move plates apart, spreading apart sea floor. magma rises and forms ridge |
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how are trenches formed |
colliding plates cause plates to subduct forming trench creating volcanoes. |
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how do earthquakes happen |
snap of moving plates |