What extrusive igneous rock type cooled so quickly that visible crystal grains never grew, and the rock is composed entirely of black silicate glass that easily shatters into sharp, knife-like shards?
(A) Obsidian
(B) Pumice
(C) Scoria
(D) Tuff
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Home » Geography » What extrusive igneous rock type cooled so quickly that visible crystal grains never grew, and the rock is composed entirely of black silicate glass that easily shatters into sharp, knife-like shards? (A) Obsidian (B) Pumice (C) Scoria (D) Tuff