Maybe because they build it to not sink and some things sink because it is how it's made
Things that float in a fluid are less dense than the fluid. Things that sink in a fluid are more dense than the fluid.
Because of the objects density.
things that are more dense sink while things that are less dense float
Boats that get holes in them.
Air resistance.
Because of density difference. High density causes the body to sink and low density makes the things to float on the surface.
things that have holes
Archimedes
no!!
Sulphur will float on water.
Wood will. A solid block of aluminum will sink. Things float when their density is less than water. There are some woods that sink.