Which sphere includes rocks and sediments?

Geosphere

Explanation:

Geosphere sometimes called as lithosphere starts from the surface of the earth and lies till crust. This part of the earth contains rocks and minerals.

This portion of the earth includes sediments,mountains and rock. The natural resources that is available to the human brings lies in geosphere.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

there's no big difference.

explanation:

the only little different between a rabbit and bunny is just that bunnies are much smaller than rabbits. bunnies are basically baby rabbits.