Why is water from an aquifer more likely to be cleaner than water from other sources?
a. because it forms where fresh and salt water meet
b. because it receives water directly from precipitation
c. because it rises to the surface near the ocean
d. because pollutants are filtered by rock and soil deep within the earth

D. because pollutants are filtered by rock and soil deep within the earth.

Explanation:

When precipitation falls, it is usually absorbed by the earth. However, below a certain depth, the ground is saturated with water (as long as it is permeable enough). This zone is known as an aquifer. Generally, water in an aquifer is cleaner than groundwater because the rock and soil that the water has to pass through filters out pollutants. Water in aquifers can be reached by drilling wells into them and using pumps to pump it out.

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