plate tectnics Flashcards

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1
Q

crust

A

the outermost shell of a rocky 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. Separated into the outer core (molten) and inner core (solid)

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4
Q

Tectonic plate

A

The layer of rock that makes up the outer part if the Earth, including the crust and upper mantle

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5
Q

continental drift theory

A

continents gradually diffed over time

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6
Q

asthenosphere

A

a thin layer of earth about 150 miles thick at the border between the mantle and the crust.

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7
Q

convection current

A

the process in which the hotter parts of a gas or liquid rise to the top and the cooler parts sink.

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8
Q

convergent boundary

A

when two tectonic plate come together

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9
Q

mountains

A

uplift of crustal plates that form elevated landmasses

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10
Q

volcanoes

A

a vent or fissure in earths surface trough which magme gasses are expelled

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11
Q

Divergent boundary

A

when tectonic plates split apart.

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12
Q

transform boundary

A

when tectonic plates slide past each other.

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13
Q

fault

A

breaks in the crust. The movement causes seismic waves which produces earthquakes

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14
Q

mid-ocean-ridge

A

a long ridge of underwater volcanoes between two diverting oceanic plates

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15
Q

subduction zone

A

a place where one tectonic plate sinks under another and melts. Also forms a trench

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