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10 cards from this deck
Wearing away of topsoil (most fertile layer)
36 billion tonnes
Water more serious - removes larger amounts rapidly
Primary transport; 0.1-0.5mm particles hop/bounce
50% cover adequate
12 times tree height
Pores filled with water not air; anaerobic conditions
Salt accumulation in soil to toxic levels
3,000-6,000 ppm
Impermeable compacted layer below plough furrow depth
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