Terracing

4. The practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food and other products
6. Rising or falling sharply
7. Any activity that modifies the visible features of an area of land
8. A ravine formed by the action of water
9. A rising or falling surface
11. Supply of water to land or crops to help growth
12. A horizontal line with respect to the distance above or below a given point

1. Business of growing crops and raising livestock
2. A piece of sloped plane that has been cut into a series of successively receding flat surfaces or platforms
3. A cultivated plant that is grown as food
5. Act of caring for or raising plants
10. Completely level or flat