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Volcanic Ash is the material produced from volcanic eruptions which is ejected into the atmosphere. It is normally comprised of carbon and mineral based debris, rock strata, granite, basault dust etc.

This material sits in the atmosphere and actually absorbs thermal energy and also helps to shield the earth from sunlight, as a result it lowers global temperatures slightly when there is a large eruption akin to either Krakatoa or St helens. It is thought volvanic eruptions could actually slow down global warming.

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