单词	sima
释义	sima /ˈsʌɪmə / noun [mass noun] Geology, dated The material of the lower part of the earth’s crust, underlying both the ocean and the continents, characterized as relatively heavy and rich in silica and magnesia. Contrasted with sial.The sial and sima both form the earth's crust which varies in thickness. Origin Early 20th century: blend of silica + magnesium.
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