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Depth of the Mponeng Gold Mine (South Africa) (3.9 km) is 4 x Height of the Angel Falls (Venuzeula) (979 m)
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Forest in Tanzania (2011) (353,000 km^2)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.