Most Common Lava Rock, Makes Up the Ocean Floor
This page is the CodyCross answer for the clue below from Mesopotamia, Group 980, Puzzle 5 (Babylonian Empire).
Question is: Most Common Lava Rock, Makes Up the Ocean Floor
and the answer is: BASALT
Word Meaning:
BASALT — (mineralogy) A hard mafic igneous rock of varied mineral content; volcanic in origin, which makes up much of the Earth's oceanic crust.
Definitions from Wiktionary.