Erosion Occurrence
Official Audio Prompt
Carbon-rich soil is dark, [blank] , and retains some water. But erosion can occur if soil is dry, which is a likely effect if it contains [blank] amounts of carbon. Erosion is of course bad for people trying to grow crops or [blank] animals on that [blank] . In the 1970s and 80s, Lal was studying soils in Africa so [blank] matter that the ground had become extremely hard, like cement. There he met a pioneer in the study of global warming, who suggested that carbon from the soil had moved into the atmosphere. This is now looking [blank] likely.
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