Igneous rocks that most likely have a two-stage intrusive-extrusive origin have a(n)____ texture.
A)aphanitic
B)porphyritic
C)glassy
D)phaneritic
E)pyroclastic

Question

Quizplus · Accepted Answer

Porphyritic texture is formed when magma cools slowly underground (intrusive) and then erupts onto the surface (extrusive) where it cools quickly. This results in two distinct sizes of crystals in the rock, with larger crystals (phenocrysts) surrounded by smaller crystals (groundmass).

Igneous Rocks That Most Likely Have a Two-Stage Intrusive-Extrusive Origin