They look like ordinary mountains off in the distance, beautiful against the pale blue sky, but what's inside that mountain is not ordinary, and sometimes, dangerous - even fatal. I'm talking about volcanoes. They're dotted all over the globe, north, south, east and west, some dormant and some not.
Volcanoes are mountains made up of various natural elements (including debris from previous explosions), but the huge rock is connected to reservoirs holding searing hot magma. And magma, being buoyant, rises, and as it rises more and more, the pressure decreases, resulting in expanding gasses. The expanding gasses send the magma flow through the Earth's crust and out into the open, through vents and fissures. We now have a volcanic eruption, and the magma that has erupted, is now called lava.
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