Explain: Clouds often form when a large mass of warm, moist air rises quickly and cools, resulting in condensation

Early in the story when tom finds an indian skull in the woods which he kicks in temper. the devil then makes his appearance and, as tom surveys him, he notices that the devil is neither "negro" nor "indian." in fact, he has a "swarthy" complexion and is "begrimed with soot."

Cause of he different elevations  hope this ?

None of them. they are likely to occur on any plate boundary