A wooden piece floats on water. . What is the reason?

This floats on water

Take some water in a wide mouthed bowl. Put an iron nail in it. What do you observe ? Put an empty iron tin in that bowl. What do you observe ?Also try to observe whether a wooden piece floats on water. What happens when a wooden bowl is dipped in water ? what is your conclusion from the above activity?

Seeds that float on water

Why do seeds float on water?

Why does the wooden block float on water even though it is heavier than a marble ?

A material that floats on water

How planktons float on water?

We use so many wooden item in our daily life .Is it good to use wood ? What happens by excessive use of it ? What is the reason ? Is there any alternative for this.

If the dried vegetables are kept in water, they become fresh. What is the reason ?