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Any rise in pressure in the chamber may now push the
magma upwards through cracks in the overlying rock. As the magma traveling up a
crack approaches the surface, the pressure from the overlying rocks reduces; gases are
released from the magma and expand so suddenly that an explosion rips open a funnel
shaped vent (called a diatreme) to the surface. The lava that blasts out of the vent then
cools, to form cinders, ash and dust - all referred to as Tephra. A ring of tephra collects
around the vent and, as the eruption subsides, this blocks up the diatreme.
Volcanoes have erupted in many different places...
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