Sandstone, limestone and chalk are members of which classification of rock?

Mo B. Richard, The word you are looking for is- sedentary. Less active people do not sink to the bottom of a liquid. At least not usually.

have seen polished limestone with the outline of shells on the surface

I can't believe I remembered my fourth year geology lesson. and yet I can't remember yesterday haha

SaltyWillOWisp96651, they will if they're too sedentary to swim!