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Volcanic Ash

Found predominantly along plate tectonic boundaries, volcanoes erupt in a number of different ways and emit a variety of materials, including magma, gases, and pyroclastic rocks. These rocks are typically referred to by different names depending upon their size. The smallest pyroclastic rocks, which are no larger than sand grains, are called volcanic ash. Larger varieties are known as cinders or volcanic bombs, which may be as great as four feet in diameter.

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