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Physics 8 Online
OpenStudy (anonymous):

A submerged submarine alters its _____ to rise or fall in the water.

OpenStudy (anonymous):

Density. A submarine has what are called "Ballast tanks" which fill with water to submerge the submarine. They are filled with air to rise to the surface.

OpenStudy (anonymous):

Ballast tank density. |dw:1401915722016:dw|

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