VoltaD)Lake Chad4The Congo River reaches the sea through a(n) __________, a place where freshwater from a river meets seawater.A)a tributaryB)an estuaryC)a tidal basinD)a flood plain5__________ supplies about half the world???s gold, one of the many mineral resources abundant in the region.A)CongoB)NigeriaC)ZimbabweD)South Africa6The weather in the region is influenced by __________.A)rainfallB)oc