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scoria |
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scoria: see pumice pumice (pŭm`ĭs), volcanic glass formed by the solidification of lava that is permeated with gas bubbles. ..... Click the link for more information. . scoriaHeavy, dark, glassy igneous rock that contains many bubblelike cavities. Foamlike scoria, in which the bubbles are very thin shells of solidified basaltic magma, occurs as a product of explosive eruptions (as on Hawaii) and as frothy crusts on some lavas. Other scoria, sometimes called volcanic cinder, resembles clinkers, or cinders from a coal furnace. scoria 1. a rough cindery crust on top of solidified lava flows containing numerous vesicles 2. refuse obtained from smelted ore; slag How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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how planted upon this once scraggy scoria of a country? Some of the interior valleys are strewed with scoria and broken stones, evidently of volcanic origin; the surrounding rocks bear the like character, and vestiges of extinguished craters are to be seen on the elevated heights. The path coiled down abruptly into a narrow ravine between two tumbled and knotty masses of blackish scoria. |
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