GEOLOGY

Detailed explanation-1: -Answer and Explanation: Groundwater pollution is hard to clean up because this water is not easily accessible since it is located underneath the Earth’s surface.

Detailed explanation-2: -Groundwater pollution is difficult to clean up because aquifers recharge slowly and because pollutants cling to the materials make up an aquifer. Groundwater is polluted by many different sources so it is hard to control all the pollutants.

Detailed explanation-3: -Polluted groundwater is difficult to clean because, groundwater is deep in the ground and dispersed through large areas of rock pollutants cling to the materials that make up the aquifer and contaminate the clean water the recycling process of groundwater can take hundreds or thousands of years.

Detailed explanation-4: -Ground water flow is much slower than flow in streams and rivers. That is because the passageways through the pore spaces are very small, so there is a lot of friction with the solid walls of the pores. Speeds of flow in streams and rivers are often greater than a meter per second.

Detailed explanation-5: -It is easier and cheaper to clean up groundwater than to prevent pollution. Cleaning water is not easy. Cleaning groundwater is especially difficult.