Khan Academy: Seismic Waves and How We Know Earth's Structure

The big question is, how do we know about the composition of the earth's core? Sal explains that at 105 degrees from the source point of an earthquake, the phenomenon of the p wave shadow zone leads us to conclude that the waves are...

Top tens lists are a lot of fun, and this one is educational as well! Viewers of the video find out ten reasons we know that the earth is not flat, as the pre-Colombus world believed. Some of the reasons are obvious, some are common...

Video lecture explores S-waves and P-waves. [8:38]

Explains how any type of wave can be refracted, and how this applies to seismic waves and to our understanding of the Earth's structure. [9:21]

A video discussing the decibel scale and how it is used to figure out the loudness of a sound. Understand how the scale is a logarithmic scale. [10:29]

Learn about the coupling of an electric field with a magnetic field to create electromagnetic waves in this video. Video also discusses how different types of electromagnetic waves have different wavelengths which forms the...

This video lecture will introduce the concepts of transverse and longitudinal waves. [13:02]

A video exploring standing waves. [14:18]

See how capillary action and the meniscus are related to intermolecular forces in water. [8:26]

A video introducing the intermolecular forces in water by exploring capillary action and the formation of a meniscus. Video will discuss the forces of adhesion and cohesion. [8:25]