Question

If you were shown one photograph of pumice and one of granite, how could you distinguish between the two rocks?

and:

Use the information about igneous rocks A–D to classify each one as intrusive or extrusive and basaltic or granitic. Fill in the chart with A, B, C, or D.
Rock A—dark-colored large grains
Rock B—large crystals, high percentage of silica
Rock C—fine-grained texture, light-colored
Rock D—from Hawaiian volcano area, no visible crystals


Extrusive
Intrusive
Basaltic
1.
2.
Granitic
3.
4.