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单词 asthenosphere
释义 asthenosphere
A layer of the earth's mantle (see earth) that underlies the lithosphere at a depth of about 70km. The velocity of seismic waves is considerably reduced in the asthenosphere and it is thought to be a zone of partial melting. It extends to a depth of about 250 km where rocks are solid
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更新时间:2025/6/23 0:50:17