Khan Academy

Milankovitch cycles precession and obliquity (K-A)

Precession causing perihelion to happen later (K-A)

Intro to Moon phases (K-A)

Season simulator (K-A)

Solar and lunar eclipses (K-A)

Seasons aren't dictated by closeness to sun (K-A)

Solar eclipse 2017 (K-A)

What causes precession and other orbital changes (K-A)

Compositional and mechanical layers of the earth (K-A)

Hawaiian islands formation (K-A)

How we know about the earth's core (K-A)

Pangaea (K-A)

Plate tectonics: Difference between crust and lithosphere (K-A)

Refraction of seismic waves (K-A)

Plate tectonics: Evidence of plate movement (K-A)

Seismic waves (K-A)

Plate tectonics: Geological features of convergent plate boundaries (K-A)

The mohorovicic seismic discontinuity (K-A)

Plate tectonics: Geological features of divergent plate boundaries-video (K-A)

Why S-waves only travel in solids (K-A)

Plates moving due to convection in mantle (K-A)

Structure of the earth (K-A)

Beginnings of life (K-A)

Biodiversity flourishes in Phanerozoic eon (K-A)

Earth formation (K-A)