| 单词 | pit-crater |
| 释义 | > as lemmaspit-crater pit-crater n. Geology a rimless, roughly circular, and often steep-sided crater or small caldera formed by the collapse of the ground on or near a volcano. ΘΚΠ the world > the earth > land > landscape > low land > hollow or depression > [noun] > crater mouth1604 crater1613 pit-crater1862 caldera1865 maar1895 1862 G. P. Scrope Volcanos (ed. 2) ix. 216 One of the chief characteristics of this remarkable class of crateriform hollows (pit-craters they have been called) is that, however deep their interior may be, their borders often rise but little..above the level of the surrounding country. 1917 Bot. Gaz. 64 395 (caption) Floor and wall of pit crater close to Kilauea. 1976 A. Rittmann & L. Rittmann Volcanoes (1978) 53 Shield volcanoes often have flat-bottomed craters with very steep sides which collapse from time to time..to..cause an increase in size of the crater itself, which is known in this instance as a pit-crater. < as lemmas |
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