sima
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si·ma
(sī′mə)n.
The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.
[si(lica) + ma(gnesium).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
sima
(ˈsaɪmə)n
1. (Geological Science) the silicon-rich and magnesium-rich rocks of the earth's oceanic crust, the most abundant individual rock being basalt
2. (Geological Science) the earth's continental lower crust, probably comprised of gabbro rather than basalt
[C20: from si(lica) + ma(gnesia)]
simatic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun | 1. | ![]() crust, Earth's crust - the outer layer of the Earth |
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