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How do we measure the amount of acidity in rain?
answered
May 4, 2017
Physics
high-school
2
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15.2k
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What is an irregular polygon
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Feb 1, 2017
Mathematics
middle-school
5
votes
17.0k
views
What solid is not made of crystals?
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May 9, 2016
Chemistry
high-school
2
votes
80.0k
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Estimate the product or quotient. 91*17
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Jan 17, 2016
Mathematics
middle-school
4
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219k
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