Seismic Waves and Earth's Interior

When you look at a seismogram the wiggles you see are an indication that the ground is being, or was, vibrated by seismic waves. Seismic waves are propagating vibrations that carry energy from the source of the shaking outward in all directions. You can picture this concept by recalling the circular waves that spread over the surface of a pond when a stone is thrown into the water. An earthquake is a more complicated process than a stone splashing into water, and the seismic waves that are set up during an earthquake are more varied than those on the pond.

A Mystery from Earth's Red-Hot Inner Core

Geologists have long known that Earth's core, some 2,900 kilometers beneath our feet, is a dense, chemically laden ball of iron roughly the size of Mars. Pressures there bear down with the weight of 3.5

Here Are 7 Unsolved Mysteries That Will Send Chills Down Your Spine. The Twins In #6... BIZARRE.

It's easy to become obsessed with the unsolved mysteries of this Earth. Most people like to think that anything can be figured out or solved... but that's just not true. Take these 7 mysteries, for example. They have been mysteries for decades (if not longer). No matter how many experts have examined the cases, they are still shrouded in mystery.


1.) The Aluminum Wedge of Aiud