Chanel I think I'm sorry if it's wrong it might be mouth
The answer to this is precipitation.
Precipitation is rain, snow, sleet or hail that falls to the ground.
So precipitation is the answer.
Hope this helped :)
Have a great day
Many could actually occur-
mountains or islands though are the main!
Contour <span>interval (CI) </span>
I would pick IRRIGATED. Hope that helped !