How does topography of the land provide a challenge for agriculture?

Much land is not suited to farming, or rather the crop-raising part of farming because of the steep slopes that make it a challenge to hold a tractor on without risk of rolling it. A large land base also has soil that is not suited for growing crops, but ideal for raising livestock on.

Basically the lay of the land and the soil underneath depicts what is best to grow or raise on it. That is the "challenge" part of it.

Many people believe that all production of livestock should be replaced by growing crops, but those same people are the ones that believe all livestock are being raised on flat land with rich soil underneath. They don't realize that much of the land that is used for livestock grazing is better suited that way because crops cannot be grown in such soils or terrain. Crops that are grown in such poor soils are better off being used as livestock feed because the producer won't get much money selling it as a cash crop.