The mountaintop mining practice of coal extraction had resulted in what environmental consequences in the Appalachian region of the US? Group of answer choices About 500 mountaintops have been flattened by the coal industry, meanwhile burying over 2000 miles of streams and rivers. About 200 mountaintops have been flattened by the coal industry, meanwhile burying over 1000 miles of streams and rivers. About 100 mountaintops have been flattened by the coal industry, meanwhile burying over 800 miles of streams and rivers. About 1,000 mountaintops have been flattened by the coal industry, meanwhile burying over 3,000 miles of streams and rivers