
Lava is formed from liquefied rock, also known as molten rock. The rock deep down in the earth is exposed to such extreme temperatures that its arse just melts. When the lava first erupts from a volcano, it can comes out at temperatures between 700 to 1200°C and perhaps higher. It can flow great distances before it cools and starts to solidify.
A volcano
is essentially a pressurised chimney which transfers the molten rock from the depth of the
earth to the surface.

Because the volcano is essentially a 64 kilometre wide, severely pressurised bath of molten rock, lying only 10km underground, the eruption of said bath would cause disaster at a level which is pretty hard to comprehend. The lava would be flung some 50 kilometres into the earth's atmosphere with virtually all life within 1000 kilometres perishing under the falling ash, lava flows and sheer explosive force of the eruption.

While this probably is a real threat, it's really nothing to dwell on. It could erupt in two years or it could be one thousand. How are we to know? There are many real threats out there, for example, the earth could be hit at any moment with a flying, giant space rock that we wouldn't even spot until it reached our atmosphere, possibly giving us a couple of minutes to call our loved ones and say goodbye. Exciting and depressing! Such is life I suppose.