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Coarse grains in a sample of Rhyolite suggest that it formed by ……
A-rapid cooling of molten rock materials at the Earth’s surface.
B-slow cooling of molten rock materials at the Earth’s surface.
C-rapid cooling of molten rock materials below the Earth’s surface.
D-slow cooling of molten rock materials below the Earth’s surface.

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    $\begingroup$ To discriminate between at surface or below surface, you have to look at the rock name. To discriminate between rapid or slow cooling, you have to look at the grain size. What does it tell you in terms of crystallization kinematics? $\endgroup$ – Jean-Marie Prival Feb 25 at 10:37

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