Shrubland landscape on the Pichu Pichu volcano (Arequipa, Peru). First centimeters of loamy sand soil sampled on the Pichu Pichu volcano (Arequipa, Peru).
When European-American settlers first began ploughing in Iowa, they found the weather and local geology had combined this organic mulch with sand and silt to form a nutrient-rich type of soil ...
Shrubland landscape on the Pichu Pichu volcano (Arequipa, Peru). First centimeters of loamy sand soil sampled on the Pichu Pichu volcano (Arequipa, Peru).
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