A decline in gold trade
Great Zimbabwe's land was rich in mineral resources, from gold, copper, and iron. In the 12th Century, a gold mine was located 40 kilometers from the city. The discovery of the mines led merchants, i.e., Arabs and Indians across the Indian ocean to flock to the city to obtain gold.
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The two processes and procedures used in estimating the age of the earth took a lot of creativity and broad imagination. When Kelvin calculated the loss of heat by the Earth and arrived at an estimated figure of 24 million years, geologist had measured the accumulation of sediment and later concluded that the earth should be around 100 million years old. Both of these techniques took a lot of imagination and creativity, thinking outside the box is a key attribute when working with science.
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