इमेजिन नेहा इज योर फ्रेंड
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An opening in the earth's crust that allows hot molten lava, ash and gases to escape from below the surface, is called a volcano. ... With time, the lava and ash flow out of the magma chamber, cool down, solidify and accumulate in layers forming a Volcano. The earth is composed of three layers: Crust, Mantle and Core.
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