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10 cards from this deck
Solids (minerals/organic), liquids (water), gases (air)
Distinct layers from additions, losses, transfers, changes
Cycle nutrients, regulate water, sustain life, filter, support
Major soil type over wide region, well-developed & mature
Black earth (Russian)
Deep black, >1m depth, clay-like, high organic matter, fertile
Loess (wind-blown sediments)
In vegetation, not in soil
2-3 years, then land abandoned to regenerate
36 billion tonnes
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