Answer: basalts

AnswerCrossword Clue
BASALTSIgneous rocks
BASALTSColumnar rocks in Wyoming's Devils Tower
BASALTSFine-grained rocks.
BASALTSDark volcanic rocks.
BASALTSSome volcanic rocks
BASALTSSome volcanic deposits
BASALTSVolcanic rocks
basaltsthe dark, hard rock from a volcano
basaltsBASALT, an igneous rock