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Definition
| zone of partially melted rock in upper part of mantle |
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Definition
| igneous rock; fine texture; used for sculpting |
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Definition
| lump of lava thrown out of a volcano while still molten |
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Definition
| pressure exerted on rock from opposite sides toward the center |
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Definition
| form when a substance heats, expands, and rises while cooler portions sink |
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Definition
| boundary where plates collide |
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Definition
| volcano: not tall; steep sided; cone around side of top; violent eruptions with lots of ash |
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Definition
| bowl-shaped depression around the mouth of a volcano |
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Definition
| phase just before or after the new Moon |
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Definition
| boundary where plates move apart |
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Definition
| mountain that forms when magma pushes against the crust above it |
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Term
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Definition
| vibrations of rocks shifting; starts in focus |
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Definition
| when Sun or Moon appear to vanish from the sky in whole or in part |
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Term
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Definition
| point on Earth's surface directly above focus |
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Term
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Definition
| dates on which days and nights are equal |
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Definition
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Definition
| a large crack in the earth through which lava can flow |
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Term
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Definition
| point deep in Earth's crust where first major movement along the fault occurs |
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Term
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Definition
| phase just before or after a full Moon |
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Term
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Definition
| igneous rock; coarse texture; used for durable building stone |
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Term
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Definition
| force that pulls everything to the center of the Earth |
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Term
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Definition
| molten rock; magma on the surface of the earth |
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Term
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Definition
| the cool solid part of the earth that includes part of the mantle |
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Term
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Definition
| lava or molten rock in the ground |
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Term
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Definition
| strength of an earthquake |
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Term
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Definition
| the layer of molten rock 120 miles under the surface |
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Term
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Definition
| measures damage of an earthquake (I-XII) |
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Term
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Definition
| a chain of mountains that runs through all the world's oceans |
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Term
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Definition
| igneous rock; smooth texture; used for making sharp weapons |
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Definition
| supercontinent when continents were joined together |
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Term
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Definition
| different shapes the moon seems to have when viewed from Earth |
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Term
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Definition
| broken sections of the Earth's crust and upper mantle |
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Term
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Definition
| the movement of plates to form land masses |
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Term
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Definition
| first wave (primary wave); "push-pull"; cause back-forth vibrations |
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Term
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Definition
| measures the energy released from the earthquake |
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Term
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Definition
| a deep valley down the center of the mid-ocean ridge |
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Term
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Definition
| process where magma pushes up through cracks in sea floor that cools to form new sea floor |
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Term
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Definition
| volcano: gentle slope; lava runs slowly out; erupts often; largest volcanoes |
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Term
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Definition
| dates in the year when Sun stops its apparent motion up or down in the sky |
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Term
| stratovolcano (composite volcano) |
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Definition
| volcano: steep; cone shaped; powerful eruptions; erupt often |
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Term
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Definition
| "roll-sway"; cause the most damage; slow |
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Term
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Definition
| secondary wave; "up-down"; right angles; slower than first wave |
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Term
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Definition
| boundary where plates grind past each other |
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Term
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Definition
| hole in crust where magma erupts [out of a volcano] |
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Term
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Definition
| mountain that contains magma and explodes cinders or lava |
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Term
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Definition
| gradual break down of rocks in the Earth's crust |
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