| 单词 | aa lava |
| 释义 | > as lemmasaa lava A kind of volcanic lava with a rough, jagged surface covered with loose clinkers. Frequently attributive, esp. in aa lava. Contrasted with pahoehoe.Early quots. refer specifically to lava in Hawaii. ΘΚΠ the world > the earth > structure of the earth > structural features > volcanic formations > [noun] > lava formations > others pahoehoe1825 malpais1844 spatter rampart1856 ring wall1858 aa1859 pedregal1881 pillow structure1897 pillow1899 pillow lava1903 block lava1914 ring dyke1915 louderback1930 1859 Amer. Jrnl. Sci. 78 70 We..saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers. 1868 Eclectic Mag. Aug. 972/2 What makes the difference between the dry aa lava and the liquid pahoehoe..is an interesting subject. 1880 Encycl. Brit. XI. 531/2 The a-a or spongy lava, which, on account of its extreme roughness and hardness, is carefully avoided by all travellers. 1890 J. D. Dana Characteristics Volcanoes 10 Lava of the aa kind occurs at Vesuvius. 1914 R. A. Daly Igneous Rocks & their Origin xiii. 291 The vesiculation of pahoehoe or ropy lava was found to be more evenly developed than in the aa or block lava. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) v. 91 At central volcanic cones, two other varieties are distinguished, the aa flow, which breaks up at its advancing front into blocks of scoria, and the pahoehoe, which flows with a ropy surface. 1974 J. Brennan Parker Ranch of Hawaii (1979) v. 53 They had to run over a'a (jagged lava, pronounced ah-ah) that could cut the average horse's feet to ribbons. 2003 National Geographic Jan. 44 (caption) A serpentine flow barely six inches wide and 50 feet long meanders through formations of smooth pahoehoe lava and rough aa lava. 2005 A. Burdick Out of Eden (2006) xiii. 163 The footing was sharp and uneven, the signature of an old a'a flow. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。