Geography test
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8 Terms
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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