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24 Cards in this Set
- Front
- Back
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asthenosphere
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zone of partiallymelted rock in upper mantle
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convergent boundary
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plates collide along it
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core
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innermost layer of earth
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crust
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outermost layer of earth
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divergent boundary
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plates move away from each other along it
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earthquake
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sudden movement of rocks in earth's crust
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epicenter
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point on earth's surface directly above focus
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focus
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point in earth's crust where an earthquake starts
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lithosphere
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layer that includes crust and upper mantle
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mantle
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layer directly above the outer core
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mid-ocean ridge
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chain of mountains through the oceans
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P wave
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push-pull or back-and-forth wave caused by earthquakes
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plate tectonics
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theory of plate movements
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richter scale
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scale that measures amount of earthquake energy
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rift
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forms where two plates move apart
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S wave
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up-and-down, slower wave in earth's crust
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sea-floor spreading
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process that forms new sea floor along rift
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surface wave
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earthquake wave that makes the ground roll and sway
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transform fault boundary
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plates grind past each other along it
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volcano
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mountain that forms around an opening in earth's crust
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crust
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the thinnest layer of earth
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pangaea
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Alfred Wegener named how todays continents used to be one super-continent
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shield volcanoes
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broad, slightly dome shaped, worlds largest volcanoes
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cinder cone volcanoes
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not much taller that 300 meters. built up from ashes, cinders, and rocks that burst from earth during a violent eruption.
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