A. What is the effect of sewage on surface water in a watershed?

When sewage is discharged into nearby rivers, it will gradually diffuse into normal water bodies and nearby soil with the flow of river basins, resulting in pollution [

Hope I helped!

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;