Comprehension Check 3.5
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extrusive - fine grained rock formed when magma cools and hardens at the earth's surface; any one: obsidian, pumice, basalt intrusive - coarse grained rock formed when magma cools and hardens while still underground: granite
List the differences between extrusive and intrusive igneous rocks. Give an example of each.
igneous sedimentary metamorphic
Name the three broad categories of rock.
granite
Name the well known igneous rock that contains quartz, feldspar, and mica.
minerals
What are the individual substances that make up rocks?
igneous
What type of rock forms when molten rock solidifies?
