Question

Which describes pumice and obsidian?








A.

Both pumice and obsidian are fine-grained extrusive 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 coarse-grained intrusive igneous rocks.