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An example of interaction between electric charges is lightning. During an 1 _______ storm, water and ice particles collide inside cumulonimbus clouds. As a result, the positive charges move to the top of the clouds and the negative 2 _______ move to the bottom. The movement generates static 3 _______. When the negative charges flow back to the positive charges they produce heat and emit light. Lightning is an electric discharge in the air. Thunder is a 4 _______ of pressure that occurs when the hot and violent lightning expands the cold air.
electric
charges
electricity
wave