Relating to the Outer Layer of the Earth

This page is the CodyCross answer for the clue below from Rainforest, Group 1216, Puzzle 3 (High Humidity).

Question is: Relating to the Outer Layer of the Earth

and the answer is: CRUSTAL

Word Meaning:

CRUSTAL — Of, pertaining to, or forming a crust, especially the crust of the Earth or other planet.

Definitions from Wiktionary.