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What causes a liquid or solution to be conductive?
Depends on the liquid.
For water (or most), it would be impurities in the water.
I hope this is not homework.
Here are some basics.
http://en.wikipedia.org/wiki/Conductivity_(electrolytic)
http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=Conductivity.htm&ID=78
Much more available on the internet.
ions.
milo
Electrons moving form one atom to the next usually initiated by EMF (basic answer). Take salt water this is a great conductor.