| 单词 | volcanic ash |
| 释义 | > as lemmasvolcanic ash volcanic ash n. loose fragmented solid material ejected from a volcano, esp. (in later use) such material in the form of powder (cf. tephra n.); (also) pumice.Also (esp. in early use) in plural in same sense. ΘΚΠ the world > the earth > structure of the earth > constituent materials > ejected volcanic material > [noun] > ash ash1667 pozzolana1684 volcanic ash1776 trinacrite1854 Santorin earth1868 pumicite1916 1776 R. E. Raspe tr. J. J. Ferber Trav. Italy v. 46 Often they [sc. the lower hills] have been covered with volcanic ashes. 1794 R. Kirwan Elements Mineral. (ed. 2) I. 410 Of Volcanic Ashes, Sand, Pouzzolana [sic], Trass, Tufa, and Piperino. 1850 D. T. Ansted Elem. Course Geol. §413 Pumice or Volcanic-ash, is a light spongy modification of obsidian. 1863 H. Watts Dict. Chem. I. 420 Volcanic ash..appears to be composed of fragments of lava, slag, mica, felspar, magnetic iron ore, augite, pumice, olivine, etc. 1893 Jrnl. Amer. Geogr. Soc. N.Y. 25 160 The steamer St. Paul..passed into a black cloud of volcanic ash. 1932 Bull. Nat. Res. Council No. 89. 26 The finer, comminuted debris ejected in volcanic eruptions is commonly called volcanic ash... It has often been criticized in that it suggests the products of combustion... By many writers, the term has been more or less restricted to the finer-grained, light-colored ejecta of acidic magmas. 2010 Evening News (Edinb.) (Nexis) 15 Apr. 7 Passengers were left stranded at Edinburgh Airport today after a cloud of volcanic ash from an eruption in Iceland forced its closure. < as lemmas |
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