noun
sima
noun
1
(geology) The dense layer of the Earth's crust rich in silicon and magnesium that lies beneath the continents and forms the ocean floor.
"The sima is denser than the lighter sial layer that makes up the continents."
How to Use Sima
Learner’s notesIn plain EnglishA geology term for the heavier rock layer under the Earth's crust, made mostly of silicon and magnesium.
Easily confused with
sial
Word Forms
simas plural, Simas plural
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The _____ is denser than the lighter sial layer that makes up the continents.
Etymology
A blend formed from "silicon" and "magnesium."