Contrast volcanic rock and sandstone
A) Sandstone has crystals but volcanic rock is amorphous.
B) Sandstone's crystal cement is made of minerals precipitated out of water, while volcanic rock's crystals formed from molten rock.
C) Volcanic rock's crystal cement is glass-like, while sandstone's cement is opaque.
D) Volcanic rock may be a mosaic of minerals, but sandstone usually forms from a single type of sand.
Answer: B
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