comets
Only if they fall into elliptical orbits that take them close to the sun. So long as they stay in the Ort cloud, they're planetesimals.
It is called dry ice because it looks like ice, but when it melts, no water comes out. It is dry. It looks like ice. This is why it is called that
Comet
The word iceberg is a partial translation from the Dutch word, ijsberg, which literally means "ice mountain." Icebergs are often referred to simply as "bergs".
i would think that black ice, refering to what's on the road, is called black ice because of the asphalt it lays on making it black.
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