Restless Earth - Destructive plate boundary Flashcards Preview

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Flashcards in Restless Earth - Destructive plate boundary Deck (7)
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1

What happens at a destructive plate boundary - STEP 1?

Convection currents in the mantle cause plates to move together.

2

What happens at a destructive plate boundary - STEP 2?

Oceanic crust is forced under the continental crust as it is heavier.
The build up of pressure here can be released as an earthquake.

3

What happens at a destructive plate boundary - STEP 3?

Oceanic crust is destroyed due to the heat in the subduction zone.

4

What happens at a destructive plate boundary - STEP 4?

Heat and pressure causes the magma to rise to the surface.

5

What happens at a destructive plate boundary - STEP 5?

The lava erupts onto the surface.

6

What happens at a destructive plate boundary - STEP 6?

Over many years many eruptions occur and layers of ash and lava build up forming a composite volcano.

7

Describe the diagram...

2 arrows pushing towards each other saying continental and oceanic crust.
Oceanic crust is half way under the continental crust.
A composite volcano on top of the continental crust.