Answer: In the agricultural regions of the United States, such as the Midwest, the migration pattern has been caused by changes in farm technology. Portions of the United States were opened up for agriculture because of the Homestead Act of 1862, where each person could receive 160 acres from the government to start a farm..
Weathering and rain can slowly chip off minerals and pieces of material. For example: When it rains enough a rock may turn into sand because of it being broken down so much.
