Earth's interior Explained in 8 minutes

Introduction to Earth's Hidden Interior00:00:00

Despite exploring the surface, humans have never drilled deep into the Earth. Scientists study the interior to understand phenomena like earthquakes and plate tectonics.

Indirect Evidence: Density, Temperature, and Volcanism00:00:40

Scientists estimate internal composition by comparing Earth's average density to surface rocks and observing the geothermal gradient, where temperature rises with depth.

Seismology: The Key to Mapping the Layers00:01:48

Seismic waves (P, S, and surface waves) provide critical data. The fact that S waves cannot travel through liquids helped prove the existence of the liquid outer core.

The Layers of the Earth and Boundaries00:03:11

The Earth consists of the crust, the mantle (containing the asthenosphere), and the core (divided into liquid outer and solid inner parts). Boundaries between these are defined by discontinuities like the Moho and Gutenberg.