Anywhere from 85-120 million years ago magma from an arc of erupting volcanoes solidified deep within the Earth’s crust and began the process of creating the Sierra Nevada. Tectonic plates began to ...

Earth’s magnetic field is constantly swirling and shifting thanks to a colossal ocean of liquid metal sloshing around in its belly, but perhaps there's more to the story. In a new study, geologists ...

Marian Posey grew up northeast of Jerome and, even as a child, paid particular attention to the many rock structures that surrounded her home. As an architectural historian, she later took on the ...