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【geology】地質學：mesosphere layer　地球內部結構
　　
1. crust [krʌst] n. 地殼
The earth's crust is its outer layer. The thickness of the earth's crust varies from about 5 miles under the oceans to about 25 miles under the continents.
● continental crust 大陸
● oceanic crust海洋地殼
　
2. stratum [ˋstretəm] n. 地層 ( = layer; pl. strata)
Strata contain clues that tell geologists what the earth was like in the past. The crust is the layer that we live on.
　
3. mantle [ˋmæntḷ] n. 地幔
Beneath the crust lies the mantle, which is the part of the Earth below the crust and surrounding the core.
　
4. lithosphere [ˋlɪθə͵sfɪr] n. 岩石圈
The lithosphere is the comparatively rigid outer layer of the earth that includes all the crust and part of the underlying mantle.
　
5. asthenosphere [æsˋθinə͵sfɪr] n. 軟流圈
The asthenosphere is a zone of the earth's mantle that lies beneath the lithosphere and consists of partially molten rock.