Horse-drawn Plow and Early Contour Farming
An early use of contour farming where crop rows match the natural lay of the land. This Iowa farmer is plowing with equipment pulled by horses.
USDA Natural Resources Conservation Service
Pathways
What do scientists learn from studying Iowa's geology? How has Iowa's geology changed?
Media Artifacts
Reading Tip: Rereading and Reviewing When reviewing articles, ask yourself how it applies to you and your life.