Plate Tectonics Flashcards

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1
Q

The outermost shell of a rocky planet.

A

Crust

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2
Q

Layer of molten rock between the crust and core.

A

Mantle

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3
Q

Made up of mostly Iron. Separated into the outer core ( molten ) and inner core ( solid ).

A

Core

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4
Q

The layer of rock that makes up the outer part of the Earth, including the crust and upper mantle ( lithospheric plates)

A

Tectonic Plate

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5
Q

The theory that continents gradually drifted over time to their present positions.

A

Continental Drift Theory

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6
Q

A thin layer of Earth, about 150 miles think, at the border between the mantle and the crust.

A

Asthenosphere

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7
Q

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

A

Convection Current

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8
Q

When two tectonic plates come together.

A

Convergent Boundary

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9
Q

Uplift of crustal plates that form elevated landmasses.

A

Mountains

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10
Q

A vent or fissure in Earth’s surface through which magma and gases are expelled.

A

Volcanoes

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11
Q

When tectonic plates split apart.

A

Divergent Boundary

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12
Q

When tectonic plates slide past each other.

A

Transform Boundary

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13
Q

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

A

Fault

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14
Q

A long ridge of underwater volcanoes between two diverging oceanic plates.

A

Mid-Ocean Ridge

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15
Q

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

A

Subduction Zone

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16
Q

A long narrow valley between two diverging continental plates.

A

Rift Valley