Geography test

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Continental Crust

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Continental Crust

Continental crusts are thicker older and lighter than Oceanic crusts. They are mainly made of granite.

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Oceanic Crust

Oceanic crusts are younger and heavier than Continental crusts mainly made of basalt and gabbro.

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Convergent/Destructive boundaries

An area on earth in which two or more lithospheric plates collide. Eventually, one plate slides under the other in a process called subduction.

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Collision boundaries

If two continental plates collide, neither can sink and so the land buckles up to form mountains.

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Transform/Conservative boundaries

They occur when plates slide past each other in opposite directions but without creating or destroying litosphere.

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Constructive/Divergent boundaries

The plates are moving apart from one another. When this happens, the magma from the mantle rises up to make a new crust.

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Hotspots

A hotspot is a large plume of hot mantle rising from deep within the Earth. A line of volcanoes develops as a plate moves over a hotspot.

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What are the 4 Primary hazards?

Lava Flow, Pyroclastic Flow, Ash Fall, Gas Erruption

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