Lower layer of the earth's crust (4 letters) — Crossword Helper

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The Clue

Lower layer of the earth's crust (4 letter answer)

The Answer

SIMA

Tags

basic crust earth igneou layer lower material rock sima

Notes

The answer SIMA is rarely seen, appearing only about once every 1600 puzzles.

Related Clues

Igneous rock
Basic igneous rock
Igneous rock material

Definition

SIMA as a noun:

1. rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium