1)fracking works mainly by a) vertical drilling b)horizontal drilling c)surface mining d)strip mining 2)the main advantage of fracking is its a)potential for economic revitalization b)cost effectiveness compared to other methods c)lack of environmental impact compared to other methods d)provision of an alternative energy source 3) environmentalists are mostly concerned with the impact of fracking on a)air quality b)seismic activity c)ground water d)endangered species 4)which sector uses the majority of the freshwater available on earth? a)people b)business c)agriculture d)home use 5. what is the most serious problem associated with the removal of natural vegetation on land? a)erosion b)lack of space for agriculture c)weathering d)decreased nutrients 6. what is the most common beach stabilization activity in nc? a)groins b)jetties c)breakwaters d)beach renourishment 7. which mountain stabilization technique is often used in agriculture? a)selective cutting of trees b)building of walls c)terracing d)fencing submit