The chemical substances such as lava, vapour, hot mud, sulphur etc gets collected on the surface of the earth due to class 7th science
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By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.....
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The answer which I think so is
Due to VOLCANIC ERUPTION
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