Rock Types: Igneous, Sedimentary, and Metamorphic Rocks Explained. Posted: March 12, 2025 | Last updated: March 12, 2025. This 1930s educational film explores the natural landscapes, geological ...

The northern lights, or aurora borealis, are a stunning sight and also an indication of Earth’s magnetic field at work. The sky over Bifrost, western Iceland, glows with the lights. Earth’s ...

The facts thus acquired, and especially the fertile conception of “petrographical provinces,” each with its suite of igneous rocks having a community of characters which bespeaks a common ...

Approximately 4.5 billion years ago, prior to the formation of a solid inner core, the planet was believed to be a huge blob of liquefied rock. In the course of time, this molten mess grew a ...