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Why do some things float and some things sink? 

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Why do some things float and some things sink? 

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Ex: A piece of ice is more dense than a dirt rock.

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Ex: a rock is more dence than a dirt rock

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Hard things mostly sink and soft things mostly float

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If you change the density of the liquid and make it more or less dense sometimes it makes the objects that sunk at first, sink.

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My group using a balance to find equal mass rock and wooden block

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The water displacement theory--the block's mass makes the water rise because it is taking up space in the cup

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The water displacement theory--the block's mass makes the water rise because it is taking up space in the cup

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My group testing to see which objects float and sink