Difficult

Halo of water, tongue of wood. Skin of stone, long I've stood. My fingers short reach to the sky. Inside my heart men live and die.

I am the greatest teacher out of them all, but alas in the end I kill my pupils.

White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!

We are five little objects of an everyday sort, You will find us all in a tennis court.

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