During an eruption, magma (molten rocks) from the depths of the earth rises to the surface.
Lava (name given to the magma that is pushed outside), red and burning, flows from the volcano.
Smoke and ashes are spewed to the sky and darken.
An active volcano contains thick lava, which rises very slowly and can form a closing pellet. The pressure increases until the gases and ashes pierce it and blow it up, causing a huge explosion.
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