What field of science could be more solid than geology? Rocks are visible, tangible. You can bang on them with a hammer, drill them, compress them, zap them with X-rays, ultraviolet light and radar, ...

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Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Ancient rock ...

The most accessible part of the earth’s interior is at the ocean’s bottom, where the crust is thin. Project Mohole, the U.S. attempt to reach the boundary layer between the earth’s crust and mantle by ...

The first samples from the farside of the moon contain signs of surprising volcanic activity near the lunar south pole. Two separate analyses of lunar rocks brought to Earth by China’s Chang’e-6 ...