[10GEO] Read the following passage; then answer the question…
[10GEO] Read the following passage; then answer the question that follows. … The deposits of fine sediment left by natural floods sustain the fertility of floodplain soils. The 5,000-year history of agriculture in the Nile Valley and delta of Egypt depended on the annual Nile River flood that left a veneer of new silt over the valley floor each year. Modern dams on the Nile— particularly the Aswan High Dam, which can store the entire annual flood — have destroyed the natural system of fertilization, necessitating huge imports of artificial fertilizers.… — Oberlander and Muller, Essentials of Physical GeographyToday, Second Edition, Random House, 1987 Based on this passage, a valid conclusion would be that _______.
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