Volcanoes

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Type of rock that is formed from volcanoes

What type of volcano has steep sides and is made up of mostly tephra?

Magma that hardens in vertical cracks.

Melted rock that is below earth's surface that is under pressure.

The largest type of intrusive igneous rock.

Where can volcanoes occur?

Magma that hardens in horizontal cracks.

Type of magma that is very thick and contains lots of silica.