Igneous Rocks

Test Description: Igneous rock review

Instructions: Answer all questions to get your test result.

1) Which characteristic provides the best evidence that this pegmatite solidified deep underground?

2) Which texture best describes an igneous rock that formed deep underground?

3) Which processes lead directly to the formation of igneous rock?

4) Mineral crystals of quartz, biotite mica, and amphibole are produced primarily by the

5) Obsidian's glassy texture indicates that it formed

6) Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene?

7) Which igneous rock has a vesicular texture and contains the minerals potassium feldspar and quartz?

8) What is the origin of fine-grained igneous rock?

9) Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?

10) Which characteristic provides the best evidence that this pegmatite solidified deep underground?

11) Which process could lead directly to the formation of pumice rock?

12) When granite melts and then solidifies, it becomes

13) Which common rock is formed from the solidification of molten material?

14) Which process is necessary for the formation of igneous rocks?

15) Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?


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