Both are sources of silt-size particles that interact with wind, sand, and vegetation to form loess deposits ... and affinity for water that make clay-size particles stick to the surface, have ...

Footprints made tens of thousands of years ago may look like they’ve been erased by time and weather, but — like invisible ...

Soils are composed of a mixture of sand, silt, clay and organic matter. Both the clay and organic matter particles have a net negative charge. Thus, these negatively-charged soil particles will ...