ont know
Erosion is the moving of weathered material and sediments from one place to another place by wind, water, ice, and gravity.
a circular hole in the bed of a river produced by abrasion
define top and define your definition of best.
Terraced fields are used on mountainous landscapes to reduce erosion and surface runoff,
no
You will have to define what "best" means to you.
Define "best"
define best
I am what they see.
Define 'best'.
You need to define best for WHAT. There is no one "best".