How can the terrain of a large area change abruptly in a short period of time?

By "short period of time", I'm referring to the timeframe of weeks to months (not days or hours). For example: at the start of one day the land is flat, but after a few weeks or months there is a mountain there instead. Another example: the land is at first joined together, but after a few weeks or months it is now separate islands.

Ideally I'd like to avoid "A Wizard Did It" type explanations (which is what I currently have), instead having something plausible for how mass changing of terrain of landscapes could occur.

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How can the terrain of a large area change abruptly in a short period of time?

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