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'm not good at sedimentary

All these types of rocks are notoriously unstable. Building structures in them require very specialized foundation

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!