You observe a dark colored igneous rock with very fine crystals that are only visible under
magnification. What can you say about this rock?
a. It cooled slowly in a magma chamber.
b. It cooled quickly in a magma chamber.
c. It cooled slowly on Earth’s surface.
d. It cooled quickly on Earth’s surface.
e. It was ejected as a fine ash and later cemented together.
D
Environmental & Atmospheric Sciences
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