Question

Obsidian, pumice, and scoria have fine grained or no visible crystals because they were formed. a) (Cooled fast/Cooled slow) b) (inside/outside) c) (above the Earth's surface/below the Earth's surface) d) intrusive/Extrusive)​

Answer 1

Obsidian, pumice, and scoria have fine grained or no visible crystals because they were formed.

a) (Cooled fast/Cooled slow)

b) (inside/outside)

c) (above the Earth's surface/below the Earth's surface)

d) (intrusive/Extrusive)