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They differ in size and origin. Volcanic ash consists of fine material ejected by a volcano up to 2 mm (0.08 in) in diameter. Lapilli consists of larger material, ranging from 2mm to 64 mm (2.52 in) in diameter. Blocks and bombs are larger than 64 mm. Volcanic bombs form when molten lava is ejected during an eruption and solidifies in the air. A volcanic block is from material that is already solid when it is ejected, coming either from country rock or rock formed by previous eruptions.

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What is a name volcanic bombs ash and cinders combined?

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