Rock picking is a yearly ritual that every midwestern farmer in the US has to perform on their farm. Even if the farm has been plowed freshly, there is a possibility of rocks emerging.
Plowing aerates the soil, bringing wet soil on top, and bringing along rocks lying in the soil bed underneath.
As per farmers in Minnesota and their neighbor Wisconsin, large boulders are harmful to their farming machinery. These rocks need to be removed often by hand.
Thus, every year, before sowing, the farmers and their families get together to pick rocks from the farms.
These rocks keep remerging over the ground every year mostly due to the frost heaving or bringing them up from the earth.
Minnesota happens to have areas with many giant boulders, due to the glaciers that dumped them thousands of years ago.
https://brainly.com/question/24840567
