THE ORIGIN OF VOLCANOES
The ancient Greeks believed the volcanic eruption occured when VULCAN , the God of Fire, stoked his subterranean furnace beneath Vulcano, a small volcanic island off sicily, From which the present word VOLCANO is derived. Of course, we no longer believe this is true. Geologists and volcanists have ascertained that volcanic activity is closely related with crustal disturbances, particularly where there are zones of weakness due to deep faulting or mountain folding. As temperature increases with increasing depths below the earth crust, at an average of rate of 1degCelsus foe every 20 metres of descent, the interior earth can be expected to be in semi molten state, comprising solid, liquid and gaseous materials, collectively called magma, the magma is heavily charged with gases such as Carbon dioxide, sulphurated hydrogen and small portions of Nitrogen, chlorine and other volatile substances. The gases and vapour increase the mobility and explosiveness of LAVAS which are emitted through the orifice or vent of a volcano during a Volcanic eruption.
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