what is volcano explain it please
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A volcano is a vent in the earth's crust through which lava, rock fragments, hot vapor and gases are ejected. A volcano begins to form when magma, which is hot molten rock from deep within the earth, rises toward the earth's surface and collects in magma chambers.
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As pressure builds within these chambers, magma is expelled through a vent or fissure in the earth's surface as a volcanic eruption. Hot molten rock outside of a volcano takes on the name lava. So you can think of 'magma' as liquid rock in the 'middle' of the earth and 'lava' as liquid rock that's 'leaving' the earth.
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