Lifecycle of Massive Stars. Created by Sal Khan.
How changes in Earth's rotation can effect Earth's seasons and climate. Created by Sal Khan.
Ozone layer and eukaryotes show up in the Proterozoic eon. Great oxygenation event (oxygen catastrophe). Created by Sal Khan.
Pangaea - the idea of Pangaea and some of the evidence behind it. Created by Sal Khan.
Parallax in Observing Stars. Created by Sal Khan.
Parsec Definition. Created by Sal Khan.
Plates Moving Due to Convection in Mantle. Created by Sal Khan.
Plate Tectonics Introduction and Difference between crust and lithosphere. Created by Sal Khan.
Plate Tectonics -- Evidence of plate movement. Created by Sal Khan.
Geological features of Convergent Plate Boundaries. Created by Sal Khan.
Plate Tectonics -- Geological Features of Divergent Plate Boundaries. Created by Sal Khan.
How K-Ar dating can be used to date very old volcanic rock and the things that might be buried in between. Created by Sal Khan.
Clarifying the effect of axial precession on the calendar and the date of perihelion and aphelion. Created by Sal Khan.
Quasar Correction. Created by Sal Khan.
Quasars. Created by Sal Khan.
Radius of Observable Universe. Created by Sal Khan.
(Correction) Radius of Observable Universe. Created by Sal Khan.
Sal's random predictions for the year 2060. Created by Sal Khan.
An introduction to red shift
Refraction of Seismic Waves. Created by Sal Khan.