What is happening when we see a meteor shower?   a A large number of dust- and sand-sized rocky grains have suddenly fallen inward toward the Sun from the Kupier belt. b The Earth is passing through a trail of dust particles left behind by a comet. c A single meteor has broken up in the Earth's atmosphere, and it produces fragments that rain down for several hours. d Volcanic activity on the Moon has blasted small rocky grains into space, some of which collide with the Earth's atmosphere.

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