Igneous questions

1. Generally as the percentage of felsic minerals in a rock increases, the rock's color will become

darker and its density will decrease
lighter and its density will increase
darker and its density will increase
lighter and its density will decrease

2. An igneous rock is composed of large mineral grains. This rock probably formed

on the surface, under high pressure, and at a rapid rate of cooling
On the surface, at high temperature, and at a slow rate of cooling
Deep underground under low pressure, at high temperature, and at a rapid rate of cooling
Deep underground under high pressure, at high temperature, and at a slow rate of cooling.

3. Igneous rocks may be identified on the basis of

Mineral composition and crystal size
Particle shape and foliation
Chemical properties and type of cement
Banding and environment of formation

4. Which two processes result in the formation of igneous rocks?

Solidification and evaporation
Melting and solidification
Crystallization and cementation
Compression and precipitation

5. An igneous rock contains 0.65 mm crystals, plagioclase feldspar, and quartz. This rock is most likely

Basalt
Rhyolite
Obsidian
Granite

6. A coarse grain, mafic igneous rock might be

Basaltic glass
Vesicular rhyolite
Andesite
Gabbro

7. Thr rock in the diagram might be



Vesicular basalt
Pumice
Obsidian
Dunite

8. A volcanic, vesicular igneous rock containing pyroxene might be

Scoria
Pumice
Andesite
Obsidian

9. Which term(s) are usually associated with igneous rocks

Intergrown crystals
Recrystallization
Foliation
Mineral alignment

10. Which of the following is a low density, glassy igneous rock?

Pumice
Vesicular rhyolite
Gabbro
Peridotite

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