Definitionn. the scum formed by oxidation at the surface of molten metals
Last update: August 27, 2015
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Immediately overhead the great crater was belching incandescent rock and scoria for an incredible distance. [Please select]
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In texture they may be stony, glassy, resin-like, vesicular or cellular and light in weight, as in the case of pumice or scoria. [Please select]
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Fragments of scoria or pumice may be thrown hundreds or thousands of feet into the atmosphere, those that fall into the crater and are flung up again being gradually reduced in size by friction. [Please select]
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