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Sink or Float?

This week, we decided to add a little science into our after school activities. I have read before that pumpkins float (on a sign at Pumpkins and More A-maiz-ing Farm, in fact). With that thought in mind, I developed a mini sink or float activity for the kids to complete. We used pumpkins and gourds that we already had around the house: a carving pumpkin, a white mini pumpkin, and a turban gourd. I filled the bathtub with water and had the girls develop a hypothesis chart. They wanted to hand-draw it but the basic premise was like this:  Pumpkin Science Chart . We talked about why they predicted that certain ones would sink and certain ones would float. Bah had already done a similar activity in Kindergarten after her pumpkin patch field trip, so she caught on a little quicker. Our test subjects and chart Testing the pumpkin Excited she was right - it floated! First, we tested the big pumpkin. We used three trials to increase our accuracy. Then, we tested...