Look what I learned on our vacation: Terracing:-)
I had never heard of this type of farming but we saw tons of it in Iowa like this:
According to Wickipedia:
In agriculture, a terrace is designed to slow or prevent the rapid run-off of irrigation water. Often such land is formed into multiple terraces, giving a stepped appearance. This form of land use is prevalent in many countries, and is used for crops requiring a lot of water, such as rice. Terraces are also easier for both mechanical and manual sowing and harvesting than a steep slope would be. Terracing slows down the speed of water and therefore allow more run-off to be sucked up by the soil.
My MiL said that each "step" is two combines wide which is best illustrated in this picture:
So, I get a nickle for learning something new:-) What did you learn on your vacation.