Airborne mercury has received special attention because it is a widespread and persistent neurotoxin(a substance that damages the brain and nervous system). Minute doses can cause nerve damage and other impairments, especially in young children and developing fetuses. The majority of airborne mercury is released by .

A. Metal ore smelting
B. Coal-burning power plants
C. Waste combustion
D. Nuclear Power plants
E. Wood-burning power plants

Explanation:

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion