Sink or Float

  Today we experimented with pumpkins?   We had a huge discussion as to why we think the pumpkins will float or sink.  There was a debate about a heavy object will sink, but a boat floats.  Then I threw it in the water and it floated!!  We tried another heavy object, a rock and it sunk!  We decided it has something to do with what's inside the object and if the object has water in it. 

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