Common Extrusive Rock Such as at Giant's Causeway
This page is the CodyCross answer for the clue below from Space Exploration, Group 910, Puzzle 4 (Interstellar Dust).
Question
Common Extrusive Rock Such as at Giant's Causeway
Answer
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.