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I think you're counting the overall sphere as the volume, but water would leak in through the finger holes so only their actual material counts. I suspect different weight bowling balls generally have different volumes.

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Bowling balls aren't hollow, they're solid spheres with finger holes drilled in. The varying weights comes from having weighted cores inside.

Oh OK thanks, I didn't realise. I just had some fun looking at bowling ball cross sections.

Also if the lake is a mile deep it would pressure the ball more than the air do.

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