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81. The shrinking of Lake Chad in recent years is chiefly attributed to what? 82. Regarding Africa south of the Sahara, to what does the Great
81. The shrinking of Lake Chad in recent years is chiefly attributed to what? 82. Regarding Africa south of the Sahara, to what does the Great Escarpment refer? 83. African farming is plagued by what conditions? 84. Why do the five pillars of Islam make it an ideal religion for a nomadic people? 85. Why did African rivers turn out to be a disappointment to the European colonial powers?