Man-made environmental anomaly refers to a phenomenon in which one or more environmental elements of the natural environment have changed significantly due to human behavior within a certain geographic area, which disrupts the relative balance of the ecosystem.
The statement 'There are abundant oil resources stored underground in a certain place. Recently, the well water in nearby villages has become turbid and accompanied by a pungent smell. It has been tested to contain a large number of heavy metals and is not suitable for drinking' is a human-made environmental abnormality according to the above definition.