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Source
Mudflats or mud flats, also known as tidal flats, are coastal wetlands that form when mud is deposited by tides or rivers.Source
They are usually found in flat areas where water collects in pools.
I think that it should be that are formed and water gets collected. Is there personification used? Is it right to say,
"Mudflats are coastal wetlands that form when mud deposits by tides or rivers"?
All thanks goes to Damkerng T.'s comment for providing me direction:
The sentences given in the question are correct as they stand. This type of speech is called mediopassive voice.By Wikipedia,
The mediopassive voice is a grammatical voice that subsumes the meanings of both the middle voice and the passive voice.
An excellent list of examples is taken as:
The book reads well.
The trousers wash easily.
Ripe oranges peel well.
The lost language from which all Indo-European languages derive.
Hydrogen combines.
About 2nd part of the question, I am not sure if we can use it two times in a sentence.
