The lava of volcanoes is molten rock , called magma.Some magma rises straight from the Eart's
mantle to the surface .Some is stored in a magma chamber in the crust, where the gases collect
and help to drive the magma out.
The upper part of the mantle, under the Earth's crust, is nealry molten. Magma contains
several gases, and bubbles of this expand near the surface and drive the magma out as an eruption . Volcanice eruptions vary from place to place, mainly according to how fluid or gasous the lava is .
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