Volcanoes are formed when magma at the centre of the Earth pushes its way upwards through the Earth through a long shaft. When the magma travels through the Earth's crust and reaches the Earth's surface, it cools and hardens into a pile of rock.
Many volcanoes are mountains as a result of this process. Indeed, the highest mountain in the world, Mauna Loa, is actually a volcano that extends for thousands of metres underwater.
More Volcanoes PowerPoint.
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