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Is groundwater contaminated by sewage from a ruptured septic tank can sometimes be naturally purified by flowing for a relatively short distance through a _ _ __.
answered
Dec 29, 2017
Health
high-school
3
votes
33.7k
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I don't know how to graph this and would appreciate some help!
answered
Nov 26, 2017
Mathematics
high-school
6
votes
180k
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In which type of reaction is an atom of one element converted to an atom of a different element? (1) decomposition (3) saponification (2) neutralization (4) transmutation
answered
Feb 23, 2016
Chemistry
high-school
5
votes
214k
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