GEL 111: MODULE 1 - Pre-Lab Questions (Igneous Rocks)

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