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单词 desert pavement
释义

desert pavement

noun Geology
A surface layer of closely packed or cemented pebbles, rock fragments, etc., from which fine material has been removed by the wind in arid regions.The stones in a desert pavement are usually about halfway embedded in the soil surface, with only their upper surfaces exposed, and are fairly tightly held in place....
  • On some of the surfaces high above the valley floors, delicate volcanic ash deposits, some as old as 13.6 million years, lie just beneath the desert pavement - the loose rock and gravel too heavy for the wind to have blown away.
  • Low mounds of silty soil pocked the stony desert pavement like so many frost-heaved ‘boils’ in an Arctic coastal plain.
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更新时间:2024/9/21 14:42:07