Plate Tectonics Flashcards

1
Q

Crust

A

The outermost shell of a rock planet

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2
Q

Mantle

A

Layer of molten rock between the crust and core

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3
Q

Core

A

Made up of mostly iron seperated into the outer core and inner core

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4
Q

Continental drift theory

A

The theory that cntinents gradually drift over time

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5
Q

tetonic plate

A

THe layer of rock that makes up the outer part of the earth

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6
Q

asthenosphere

A

a thin layer of earth about 150 miles thick at the border between the mantleand the crust

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7
Q

convection current

A

the prosses in witch the hotter parts of a gas or liquid rise to the top and the cooler dense part sink

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8
Q

convergent boundry

A

When two tectonic plates come together

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9
Q

mountaians

A

uplift of crustal plates that form elevated land masses

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10
Q

volcanoes

A

a vent or fissure in earths surface through witch magma and gases are expelled

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11
Q

divergent plates

A

divergent boundary when tectonic plates move away from each other

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12
Q

fault

A

breaks in the crust the movement causes sesmic waves which produces earthquake

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13
Q

midoceanic ridge

A

a long ridge of underwater volcanoesbetween two diverging oceanic plate

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14
Q

subduction

A

A place where one tectonic plate sinks and another melts causing a trench

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15
Q

Rift valley

A

A long narow valley between two diverging continental plates

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