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There's a lot more to Earth than meets the eye. Far from being just a roundish rock barreling through space, our planet is composed of several layers held together by intense forces of gravity.

Potential patches of Earth's ancient crust, sometimes called "sunken worlds," may have just been discovered deep within the mantle, thanks to a new way of mapping the inside of our planet.

“We need to build noncombustible homes.” It may seem fanciful to require earth-block construction in high-risk areas, but we’ve made similarly radical changes before. American downtowns used ...