These brilliant flashes—called fireballs—are caused by space rocks, or meteoroids, entering Earth's atmosphere at high speed. While most of them ... of water-bearing minerals, carbon, and ...

More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple ...

A secure, green, and innovation-filled future awaits us, but only with the help of rocks buried deep in the ground New forms of energy, more mouths to feed, and exciting innovations in technology—all ...