Smarty Pants Quiz
09
00
00
The most common rock on Earth's service is called?
Slate
Basalt
Unakite
Quartz
That wasn't it... Try again!
Bubbles of gas trapped in cooling lava create holes in the rock.
Brilliant! How about this one?
09
00
00
The most common rock on Earth's service is called?
3 of 5 people (60%) answered this question correctly.
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