Smarty Pants Quiz
09
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What do we call the layer of gas that blocks the Sun's harmful rays?
The northern lights
The greenhouse layer
The ozone layer
Whoops! Try again!
Ozone (O3) is a gas molecule composed of three oxygen atoms.
Alright, pretty good, try this!
09
00
00
What do we call the layer of gas that blocks the Sun's harmful rays?
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