The soil that's darkest in color is widely known as topsoil. The color of bare soil varies, and that variation is related to soil quality. The new study emerged from a simple observation, one that people flying over Midwestern farms can confirm for themselves. Some of their colleagues, however, remain skeptical about the methods that produced this result. The most fertile topsoil is entirely gone from a third of all the land devoted to growing crops across the upper Midwest, the scientists say. A team of scientists just came up with a staggering new estimate for just how much has disappeared. Soil on hilltops in this photo is lighter in color, revealing a loss of fertile topsoil.įarming has destroyed a lot of the rich soil of America's Midwestern prairie.
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