Nearly 40% of all the gold mined worldwide comes from Witwatersrand Basin, located in which country?

A1 - China
B2 - India
C3 - Brazil
D4 - South Africa

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Answer: South Africa is famous for its rich deposits of gold, the vast majority of which comes from the Witwatersrand Basin, an underground geological formation believed to have once been the floor of a prehistoric sea where rivers deposited their sediments, forming gold and other minerals. The basin holds the richest reserve of gold ever discovered the world. Over 2 billion ounces of gold have been mined from its goldfields since its discovery in the late 19th century. It’s estimated that 40 to 50 percent of all the world’s gold ever mined has come from Witwatersrand

Also -

Lake Superior is the world's largest freshwater lake in terms of surface area – and holds 10% of the world's surface fresh water. In fact, if you were to combine all the water in Lake Michigan, Lake Huron, Lake Ontario, and Lake Erie, its volume would still be less than that of Lake Superior.

The deepest point of Lake Superior is 1,330 feet – by comparison, the Empire State building is 1,250 feet tall from ground to roof. If you built the Empire State Building on the deepest point of Lake Superior, the only thing peeking above the waves would be the antenna.