Figure 9: Examples of Mollisols (grassland soils) formed from loess. Both soils have mean annual precipitation of 450 mm. The Ustoll (a) has an ustic soil moisture regime and the Xeroll (b) has a ...

Producers spot healthy soil through diverse ground cover, beneficial insects, earthworms and lab tests measuring microbial ...

A worm burrows its way through the dark earth, ingesting particles of soil and expelling nutrient-rich casts in a constant forage for food. Charles Darwin described earthworms as one of the most ...

Geologists in California and Wyoming use unique palettes to teach science Art Meets Science Becca Dzombak Soil samples collected throughout the western United States show the wide variety of minerals ...