Geography- Restless Earth

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Created by: Sallyhaddon21
Created on: 26-11-15 16:59

Name 3 features of Continental Crust.

Older the oceanic, less dense and it can not sink into the mantle

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Name 3 features of Oceanic Crust.

Newer than continental, denser and it can sink into the mantle

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What is continental drift?

Heat from RADIOACTIVE DECAY heats up the rock so it rises to the LITHOSPHERE. The rocks rises to a certain point where it is cooler and so it falls creating CONVECTION CURRENTS. This makes the TECTONIC PLATES move apart so continental drift happens.

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Explain what happens at a destructive plate margin.

When the oceanic crust goes under (subducts) the continental crust. Molten rock then builds to make a volcano.

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Explain what happens at a constructive plate margin.

The two plates move apart and the hot molten rises rises and cools at the top to form new land.

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Explain what happens at a conservative plate margin.

The two plates move side by side.

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What is collision?

When the two pieces of crust push up against each other to form a fold mountain

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What are fold mountains?

Places where layers of rock have been crumpled as they have been forced together. They can be formed at destructive or collisional plate boundaries.

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How are fold mountains formed?

Sediment ACCUMULATES in shallow seas creating layered sedimentary rocks-COMPRESSION takes place. Two plates move together which starts to CRUMPLE the rocks. The rocks start to form folds which are pushed upwards.

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How are mid ocean ridges formed?

Two oc

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