单词 | asthenosphere |
释义 | Word Frequency asthenosphere(əsˈθiːnəˌsfɪə, -ˈθɛn-) noun a thin semifluid layer of the earth (100–200 km thick), below the outer rigid lithosphere, forming part of the mantle and thought to be able to flow vertically and horizontally, enabling sections of lithosphere to subside, rise, and undergo lateral movement See also isostasy Word origin C20: from astheno-, from Greek asthenēs weak + sphere |
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