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There is an energy associated with various types of waves in nature.
Some waves, like water or sound waves, propagate by actual movement of
some material (water for water waves, air molecules for sound waves).
One important form of wave - the light wave - can propagate in a
vacuum; in this case, it is oscillating electric and magnetic fields
which are ``waving''. Because of this movement or oscillation, all
types of waves have an energy associated with their motion.