Which describes pumice and obsidian? a. both pumice and obsidian are coarse-grained intrusive igneous rocks. b. pumice is a coarse-grained extrusive igneous rock, while obsidian is a fine-grained intrusive igneous rock. c. pumice is a fine-grained intrusive igneous rock, while obsidian is a coarse-grained extrusive igneous rock. d. both pumice and obsidian are fine-grained extrusive igneous rocks.
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