They are also great places for studying geology. A human life is short if compared to the age of rocks. The oldest rock found on Earth is more than 4 billion years old, formed during the Hadean ...
Gold has both economic and cultural significance to human societies but, as Liang Zhang and David Groves explain, we owe its presence in the Earth’s crust to repeating cycles of plate tectonics.
Smith, A. J., Stride, A. H., and Whittard, W. F., Proc. Seventeenth Symp. Colston Res. Soc. (1965). Whittard, W. F., Proc. Roy. Soc., A, 265 (1962). Hersey, J. B ...