What functions do catchment areas and wetlands have in getting water to our villages, towns and cities? mention three.

Catchment areas are essential for bring water to our villages, towns, and cities because they help to collect and push water resources into a centralized location for humans to use. These areas are essential to supporting life as well because catchments help to refill groundwater resources that are used in many processes of human life. In addition wetlands help to process water that is polluted making it safer for human use and also better for the environment to prevent damage. 

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Maybe on the physical part? i dunno i just guessed plus i really need the points