How do I separate a mixture of gravel and raisins w/o using mechanical means?

Without sorting the mixture by hand or other mechanical means, describe a method to separate a mixture of raisins and pea-gravel (small rocks with the same coloring and size as the raisins). I thought of adding water to separate the mixture, but then it came to my realization that both gravel and raisins sink in... show more Without sorting the mixture by hand or other mechanical means, describe a method to separate a mixture of raisins and pea-gravel (small rocks with the same coloring and size as the raisins).

I thought of adding water to separate the mixture, but then it came to my realization that both gravel and raisins sink in water...
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