Question

Terracing is a system which prevent?​

Answer 1

Terracing is a soil conservation practice applied to prevent rainfall runoff on sloping land from accumulating and causing serious erosion. Terraces consist of ridges and channels constructed across-the-slope. And it makes room for crop growing.

I got this from google, hope this helps!

Answer 2

Terracing is a system which farmers use in order to save water conservation on the fields. Farmers tend to make slopes and ridges for the effective movement of water along the field. The reason for doing that is rain water gets accumulated in the soil which is harmful for the crops.

They cause corrosion and fungi in the soil that hinder the growth of the crops. Therefore terracing is done alone with sharp ridges along the ends of it for effective conservation.