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 is: Common Extrusive Rock Such as at Giant's Causeway

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.

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