'The Earth’s core is not literally stopping; however it is changing.' | Opinion by Don Lincoln
Editor’s Note: Don Lincoln is a senior scientist at the Fermi National Accelerator Laboratory. He is the author of several science books, including his new book book “Einstein’s Unfinished Dream: Practical Progress Towards a Theory of Everything.” He also produces a series of science education videos. Follow him on Facebook. The opinions expressed in this commentary are his own. View more opinion on CNN.
The crust under the Earth’s continents can be about 40 miles deep, although the crust under the oceans can be much thinner. Figuring out the structure of the Earth requires indirect methods, involving studying how fast the waves from earthquakes travel through the Earth, or studying the rich treasure trove of data of how the sound from nuclear blasts pass through the Earth. With a few exceptions, nuclear testing stopped in the mid-1990s.
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