| 单词 | boulder clay |
| 释义 | boulder clay (once / 61882 pages) n WORD FAMILY boulder clay: boulder clays USAGE EXAMPLESGlacial boulder clay lies over much of the lower ground, and ridges of gravel and sand flank the hills and form extensive sheets. Various, Encyclopaedia Britannica, 11th Edit...(2011) Occasionally, within the boulder clay, there are irregular lenticular masses of more or less stratified sand, gravel or loam. Various, Encyclopaedia Britannica, 11th Edit...(2010) The boulder clay of Germany is supposed to have accumulated underneath this vast "mer de glace," as he calls it. Scharff, Robert Francis, The History of the European Fauna(2010) n unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together Syn|Hyper till dirt, soil the part of the earth's surface consisting of humus and disintegrated rock |
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