Answer
The rift valley system of East Africa is rich in human ancestor fossils due to its unique geological setting. The tectonic activity along divergent plate boundaries creates fault lines and sedimentary basins where fossils can be preserved. The region's alternating wet and dry climate, with the presence of lakes and rivers during humid periods, provided opportunities for fossilization. Over millions of years, the East African Rift has accumulated layers of sediment, leading to a well-preserved record of ancient life forms, including important fossils of early hominins. This favorable combination of geological processes and environmental conditions has made the region a significant source of human ancestor fossils.
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