8 terms

Volcano formation.

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Magma
Inside
Lava
Outside
Step 1
Magma rises through cracks or weaknesses in the Earth's crust.
Step 2
Pressure builds up inside the Earth.
Step 3
When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption.
Step 4
The lava from the eruption cools to form new crust.
Step 5
Over time, after several eruptions, the rock builds up and a volcano forms.
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