A layer of charged particles, called the ionosphere, surrounds Earth, extending from about 50 to 400 miles above the surface of the planet. Disclaimer: AAAS and EurekAlert! are not responsible for ...
Beyond the outer core lies the mantle, a 1,800-mile-thick layer of viscous molten ... Photograph by Garcia Julien, Getty Images We also enjoy protection from Earth's magnetic field, generated ...
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