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yer kabuğu
environ.
地壳
地球结构的外层,厚度为6公尺至48公尺,包含莫霍(洛维奇)不连续面(一个引起地震的不连续面,出现在地壳及其下的地幔之间;这不连续面出现在陆地下平均35公里和海洋下大约10公里处)以上的所有物质。 以前认为一个冷却坚固的表层覆盖着热熔融内部的想法,现在已被地壳是由两层外壳组成的概念所取代,一个是硅镁组成的内部基本单元(大洋地壳),一个是由硅铝组成的外部花岗石单元(大陆地壳)。
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