英语词汇“boulder clay”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	boulder clay
释义	boulder clay noun [mass noun] Clay containing many large stones and boulders, formed by deposition from melting glaciers and ice sheets.It's a deep, steep-sided ravine formed in Magnesian Limestone and boulder clay.... Erosion at Filey Bay is due to the sea and the rain attacking the cliffs, which are made of boulder clay - a mixture of sand, stones, and soil - which becomes soft when wet. A rough stone capping has already been laid on the underlying boulder clay on a 1.5 kilometre section.
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