Practice Questions Igneous Rocks

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Practice Questions: Igneous Rocks
1. What is the color and type of rock that forms oceanic
4. Which graph best represents the relative densities of
crust at mid-ocean ridges?
three different types of igneous rock?
A) light colored and igneous
A)
B) light colored and sedimentary
C) dark colored and igneous
D) dark colored and sedimentary
2. Obsidian's glassy texture indicates that it formed
A) slowly, deep below Earth's surface
B) slowly, on Earth's surface
B)
C) quickly, deep below Earth's surface
D) quickly, on Earth's surface
3. The flowchart below illustrates the change from melted
rock to basalt.
C)
The solidification of the melted rock occurred
A) slowly, resulting in fine-grained minerals
B) slowly, resulting in coarse-grained minerals
C) rapidly, resulting in coarse-grained minerals
D) rapidly, resulting in fine-grained minerals
D)
5. Which igneous rock is dark colored, cooled rapidly on
Earth's surface, and is composed mainly of plagioclase
feldspar, olivine, and pyroxene?
A) obsidian
B) rhyolite
C) gabbro
D) scoria

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