Why does a block of plastic released under water come up to the surface of water?

Why does a block of plastic released under come up to the surface of water ?

Why does a block of plastic immersed under water come to the surface of water ?

Answer the following questions : Define Buoyant force . A plastic cube is released in water will it sink or come to the surface of water ?

A plastic cube is released in water. Will it sink or come to the surface of water ?

Why does oil spread over the surface of water?

How does the water come out through the surface of porous earthen pot?