________ is a felsic igneous rock with a meringuelike vesicular texture, consisting of very small holes, created by small shards of volcanic glass

A) Scoria
B) Obsidian
C) Granite
D) Pumice


Answer: D

Environmental & Atmospheric Sciences

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Which of the following is an example of a keystone species?

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A geologist looks at a piece of rock from Yosemite National Park under a microscope and sees tiny crystals of olivine, pyroxene, and plagioclase feldspar. What process might have formed this rock?

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Environmental & Atmospheric Sciences