Is it safe to microwave a rock?
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                            Rocks won't heat up well in microwave ovens. Microwave oven work by exciting the water molecules in food and heating them up internally. Rocks have practically speaking, zero moisture content so they won't heat up, much like the ceramic or stoneware dishes you warm your food on.. 
                    
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                                   So to make up for their poor diet, they eat minerals, including salts. They also often gnaw on the pots to get the salt and to keep their continuously growing teeth from getting too large. ... Provide them instead with a squirrel salt lick, or mineral block. 
                                
                            
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