What is surface mining? Define overburden and spoils. Define open-pit mining and strip mining, and distinguish among area strip mining, contour strip mining, and mountaintop removal mining. Describe...

What is surface mining? Define overburden and spoils. Define open-pit mining and strip mining, and distinguish among area strip mining, contour strip mining, and mountaintop removal mining. Describe three harmful environmental effects of surface mining. What is subsurface mining? What is acid mine drainage? Define tailings and explain why they can be hazardous. What is smelting and what are its major harmful environmental effects?