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Light can also be described as a wave.The energy of light travels through a medium called an electromagnetic field.This field exists everywhere in the universe.It travels when energy disturbs it,just like the rope moves up and down when someone shakes it.Unlike a wave in water or a sound wave in air,light waves don't need a physical substance to travel through.They can cross empty space because their medium does not involve physical substance. 8.What can we learn about waves in the first two paragraphs? A.They make energy move back. B.They appear in different forms. C.Their travel shapes the medium. D.They move to transform the energy.