GEL 111: MODULE 1 - Pre-Lab Questions (Igneous Rocks)
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What textures are possible in intrusive rocks (List all that apply)
- Larger crystals - Phaneritic - Porphyritic - Pegmatitic
What textures are possible in extrusive rocks? (List all that apply)
- Smaller crystals - Aphanitic - Vesicular - Glassy - Pyroclastic
Which of the following are mafic minerals? (Select all that apply) A. Quartz B. Pyroxene C. Plagioclase D. Olivine
B, D
Rocks that cool slowly have __________ crystals.
Large
Rocks that cool quickly have __________ crystals.
Small
True or False? Rocks formed from volcanic eruptions are an example of extrusive igneous rocks.
True