Convection currents

Heat stage:
Heat from the core heats the mantle.
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Rising stage:
The heated mantle rises towards the crust. Hot mantle cannot easily force through the crust so it is forced sideways.
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Cool stage:
The mantle cools down.
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Sink stage:
Mantle sinks back towards the core.
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Repeat stage:
The mantle cannot pass through the core so it heated and rises.
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What does this process form?
Convection currents within the magma.
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Where does ridge push happen?
At spreading centres where plates are moving apart.
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Where does slab pull happen?
At subduction zones where one plate is pulled down to the mantle.
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What is slab pull?
The pull of gravity on a plate that is being subducted.
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Other cards in this set

Card 2

Front

Rising stage:

Back

The heated mantle rises towards the crust. Hot mantle cannot easily force through the crust so it is forced sideways.

Card 3

Front

Cool stage:

Back

Preview of the front of card 3

Card 4

Front

Sink stage:

Back

Preview of the front of card 4

Card 5

Front

Repeat stage:

Back

Preview of the front of card 5
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