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Magma is not explosive. It is however under pressure like water in hose.

If you increase the water pressure in hose it will eventually rupture, sometimes violently. Magma contained in the volcano acts the same way. There are often gases associated with magma and lava that may spew the ash and magma a considerable distance, this is not an explosion.

Magma sometimes flows over a pond of water or falls into the sea. The violent creation of steam looks explosive but again, it is just rapid expansion.

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16y ago

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