Watermelon sink or float in water?

A tomato, brinjal, potato, iron nail, sponge, wood, stone, leaf, piece of chalk and paper are given. Predict which of them sink or float in water. Record your predictions in table.

This floats on water

How planktons float on water?

Iron nail sinks in water. Empty iron tin box floats on water. why?

Seeds that float on water

Why do seeds float on water?

Which objects sink in kerosene but float on water ?

Iron sinks in water, wood floats in water. If we tie an iron piece to the same volume of wood piece, and dropped it water, would it sink or float ? Make a guess and find out whether yours gucess is correct or wrong with an experiment. Give reasins.