Imagine you want to buy some land and build your dream house. You review all the building sites available to you, and find two sites that fit your criteria. You visit both sites two days after a hard rain. The second site is on a gentle slope and the owner tells you he ploughed the site just last week. The soil is light brown in color, and quite dry even though it rained only two days ago.
Deep rills cross the plough rows.
Compare the two sites.