| 单词 | lava tube |
| 释义 | > as lemmaslava tube lava tube n. a tubular cave occurring naturally in some solidified lava flows. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > lava > tubular cave occurring in lava flow lava tunnel1905 lava tube1927 1927 H. S. Palmer Geol. Honolulu Artesian Syst. 29 Many lava flows develop hard crusts by the cooling and solidification of the upper surface. Later the supply of lava for the particular flow may cease and the liquid lava stream may drain out leaving a long tubular opening under the crust. Lava tubes formed in this way would be as good as artificial pipes for carrying water. 1931 Bull. Geol. Soc. Amer. 42 310 Small stalactites of opal occur in a lava tube 20 miles northeast of Red Bluff, California. 1965 Oregon State Dept. Geol. & Mineral Industry Bull. lviii. 9 This large lava tube..is a mile long (1.6 km), and it can be easily entered where the roof has collapsed. 1979 United States 1980–1 (Penguin Travel Guides) 510 There's good diving in the Pine Trees area (lava-tube caves big enough to drive a Volkswagen through, [etc.]) 1993 K. S. Robinson Green Mars (new ed.) 439 She stepped into an observation gallery cut into the side of the lava tube. < as lemmas |
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