Asked by dom

is vesicular basalt instrusive or exstrusive

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Answered by GPT-5 mini AI
Vesicular basalt is extrusive.

"Vesicular" means it has many gas‑bubble cavities (vesicles) formed as gas escaped from lava during rapid cooling at or near the surface. Basalt is a mafic, fine‑grained volcanic (extrusive) rock — scoria and amygdaloidal basalt are common vesicular varieties.