Both a and c are correct. Advanced agricultural societies. For deep injection well disposal of liquid wastes, what other type of rock layer must overlie the porous and permeable rock layer into which the waste will be injected a. Sandstone. A fractured limestone. None of above.
Leachate overflow is a.
The groundwater table intersecting the ground surface on a hillside. When rainwater fills a waste disposal site and flows over the top of the liner. Deforestation causes rapid runoff into local streams. Acid runoff resulting from weathering of sulfur-containing minerals often occurs during a. Mining of coal. Both a and b are correct.