Read the following passages and determine the author’s impli…
Read the following passages and determine the author’s implied topic and main idea. Passage C The Aswan High Dam, built in Egypt with Russian support, was supposed to provide hydroelectric power and to increase Egypt’s food supply by controlling the unpredictable Nile River. The project meant that great art treasures were flooded as submerged land was drained for cultivation. However, only one-tenth of an acre of land was made available for each person added to Egypt’s population during the period of construction. One result of the dam was that the Nile no longer flooded the delta farmlands annually. These annual floods served to restore the farmland fertility with deposited silt. This no longer the case, the quality of the farmland decreased. The dam also cut off the nutrients that had been washed to the Mediterranean Sea as a result of the annual floodings. Because of this, or the change in the salinity of the sea that the dam produced, the sardine catch dropped from 18,000 tons per year to 500 tons per year. The stable lake created by the dam allowed aquatic snails to flourish. The snails serve as an intermediate host to a blood fluke that bores into humans causing the dreaded disease, schistosomiasis. The construction of that dam had important political implications at the time.
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