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 traveling through different densities and types of material. The mantle, the crust, and the core of our planet are discussed.

Concepts

the earth's mantle, the earth's layers, p waves, s waves, waves

Show More Show Less

Additional Tags

p wave shadow, core, mantle, waves, p waves, s waves, science

Show More Show Less

Classroom Considerations

• This video is hosted on YouTube