Answer:
<u>Benefits</u>:
pesticides can keep harmful pests–such as rats, mice, ticks and mosquitoes–away from crops while also protecting the plants from weeds and diseases that have the ability to greatly reduce crop yield.
<u>Environmental impacts</u>:
Pesticides may move with runoff as compounds dissolved in the water or attached to soil particles. Runoff from areas treated with pesticides can pollute streams, ponds, lakes, and wells. Pesticide residues in surface water can harm plants and animals and contaminate groundwater.
The answer is septic systems, agricultural chemicals, <span>leaking of landfills.
</span>
<span>Groundwater is a water under the surface of the
Earth. It is widely used as a source of freshwater. Thanks to
its underground position, it is not as much vulnerable to pollution such as surface
water. However, some leaking of landfills, septic systems and agricultural
chemicals that can reach it deep down under the surface can cause groundwater
pollution.</span>