What is the first color that comes to mind when you envision soil? Is it brown, black, yellow, or red? How about white, gray, green, or blue? Experts now explain that all of these answers are correct ...

Imagine the dusty red dirt of the Utah desert, the dark spongy soils of the Cascades’ old-growth forests, or a gray sandy path through some lanky Florida pines. A glance at any of these soils can help ...