Smarty Pants Quiz
09
00
00
The most common rock on Earth's service is called?
Unakite
Basalt
Quartz
Slate
That wasn't it... Try again!
Bubbles of gas trapped in cooling lava create holes in the rock.
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09
00
00
The most common rock on Earth's service is called?
4 of 6 people (66.67%) answered this question correctly.
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