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Which of Steno’s principles is responsible for the thin undisturbed layers found in the Grand Canyon? A.principle of superposition B.principle of original horizontality C.principle of original lateral
answered
Oct 21, 2017
Biology
middle-school
5
votes
24.3k
views
Type the formula for the number of combinations of n things taken r at a time. C(n, r) =
answered
Aug 29, 2017
Mathematics
high-school
0
votes
12.5k
views
Could use some help on 22
answered
Jul 14, 2017
Mathematics
middle-school
3
votes
59.4k
views
Which kind of reaction is shown below? 2H2O2 → 2H2O + O2
answered
Apr 8, 2017
Chemistry
high-school
4
votes
185k
views
How the Crusades and the Renaissance influence exploration of the world?
answered
Sep 19, 2016
Social Studies
middle-school
4
votes
201k
views
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