Answer:
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Ummm.... Using complete sentences, capital letters, and punctuation is ALWAYS necessary -- even when not completing a writing assignment.
Explanation:
Asteroids are small rocky objects (smaller than a planet) that orbit the sun.
Meteoroids are the small pieces of an asteroid that broke off when one asteroid smashed into another asteroid.
* [ By the way, if a meteoroid enters the Earth's atmosphere, it vaporizes and turns into a meteor, and we call it a "shooting star."]
* [ By the way, when that meteor doesn't completely vaporize in the atmosphere and it lands as a rock on Earth, we call it a meteorite. ]
Comets are like dirty snowballs. They are made of frozen gases, such as carbon dioxide, methane, and ammonia, as well as water ice, in which dust particles and rocky material are embedded.
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I've explained as simply as I can. I hope I've helped you.
