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Which isotope is appropriate for dating rocks that are billions of years old? carbon-12 carbon-14 uranium-238 oxygen-16
asked
Jul 20, 2018
Physics
middle-school
2
answers
1
vote
209k
views
What is a substrate?
asked
Jun 9, 2018
Biology
college
1
answer
4
votes
198k
views
-1.55 as a a fraction or mixed number in simplest form.
asked
Apr 28, 2018
Mathematics
middle-school
1
answer
3
votes
107k
views
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