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Igneous Rocks
Review and Reinforce
1. Coarse-grained
2. Smooth and shiny with no visible grain
3. Fine-grained
4. basalt; the ocean’s crust, shield volcanoes, and
lava plateau
5. granite; mountain ranges
6. Lava that is low in silica usually forms darkcolored
rocks; magma that is high in silica usually
forms light-colored rocks.
7. Igneous rocks are hard, dense, and durable.
8. Answers may vary. A typical answer might
mention granite as a building material, basalt as
a construction gravel, and pumice as an abrasive
in polishes.
9. extrusive
10. intrusive
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