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Ash is the solid substance which is left when something is burned. Burning combines oxygen from the air with carbon and hydrogen in whatever is being burned to form carbon dioxide and water vapor which goes into the atmosphere as smoke. The hotter the heat, the more of the substance which is consumed, the more smoke there is, and the less ash.

In volcanoes, the heat is extremely intense and burns the rocks and soil to ash. Explosions in the volcano can send this ash flying into the air. This is what buried Pompeii.

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Q: What is the definition of the word ash the kind that covers up things that have been burned from lava?
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