Answer:
Wastewater treatment
Explanation:
The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.
Rural settlement means people living in rural areas, that is, not in the cities (which are urban areas).
Less and less people live in rural areas because there are less jobs there than in the city as our farming becomes more and more industrialized - before more people had to work on the farm, as more things had to be done by hand.
I'm assuming you mean topographic maps, in that case C. Elevation
im acully on this qution write know if u look it up someoneelce just asked this quetion thjey have the ansere just read it and ull find it hope this helps mam/sirExplanation:
