Scientific Study of Rocks
This page is the CodyCross answer for the clue below from Forms of Communication, Group 2225, Puzzle 4 (Guestbooks).
Question is: Scientific Study of Rocks
and the answer is: GEOLOGY
Word Meaning:
GEOLOGY — The science that studies the structure of the Earth (or other planets), together with its origin and development, especially by examination of its rocks.
Definitions from Wiktionary.