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There's not much mass therefore the rock floats because the pumice is hollow

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Pumice is a  bubble-rich volcanic glass with low density. It is easily handled because of its low density and that why when its in the ocean its floating.

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The rocks can be solid but still be able to float, that is because the density is very low, and because the mass is very low but the volume is higher then the mass itself which can cause the rocks in the ocean to float.

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Pumice floats because the volume of the pumice is higher than the mass.

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I think all of this is happening because the density is low so it makes it easier to float.

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Maybe the volume of the pumice is very high, compared to its mass, allowing it to float in the body of water.

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the rocks float because the density is very low

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the holes in the rock may help it have a lower density

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its proply the type of rock because it has very low density

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The density of the rocks are probably really low, causing it to float. To figure out the density you need to divide the mass and volume, they both need to be just the right number to make the density a low number to make it float.

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Pumice floats because it goes off heat the heat makes them float and once the temp drops they will sink. They also float by trapped gas with the heat of the day.

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Pumice rocks have holes on the inside of them which may help the rocks floating. The density has to be really low to kepp it floating.

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Alejandro Valencia               The density must be really low..... the mass is most likely a lot lower than the volume that's why the rocks are floating and not sinking 

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Alejandro Valencia               The density must be really low..... the mass is most likely a lot lower than the volume that's why the rocks are floating and not sinking 