The Earth's interior is composed of four layers ... thick beneath the oceans to an average of 25 miles (40 kilometers) thick beneath the continents. Currents within the mantle have broken the ...

The Orion Spur branches off from the Sagittarius Arm, one of the galaxy's two major spiral arms. Earth's circumference ... is the content manager at Live Science. She is a science writer and ...

The study of Earth science isn’t just for students who are interested in how our planet works. It’s also for those who are passionate about addressing urgent global challenges such as climate change, ...

At least two mass extinction events in Earth's history were likely caused by the "devastating" effects of nearby supernova explosions, a new study suggests. Researchers at Keele University say these ...