Modern-day mexico city sits on the site that was once lake texcoco, home of the aztec civilization. this change is an example of

This is an example of eutrophication or succession. Eutrophication occurs when minerals, nutrients and soil gather up on the bottom of a body of water, and eventually it fills up. After this occurs a land ecosystem is made, and it slowly grows. Depending on the size of the body of water it can take  a year or hundreds of years. Lake Texcoco filled up and a civilization was built in its place.

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