what is meant by volcano?
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A volcano is an opening on the surface of a planet or moon that allows material warmer than its surroundings to escape from its interior. When this material escapes, it causes an eruption. Lava fountain at Kīlauea Volcano, Hawai`i is an example.
They are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust. A build up of pressure in the earth is released, by things such as a plate movement which forces molten rock to exploded into the air causing a volcanic eruption.
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Volcano :- volcano is a rupture in the Earth's crust where molten lava ,hot ash and gases from below the Earth's crust escape into the air..
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