Khan Academy Static

Geologists and archaeologists will tell you how old things are or when they happened, but how do they know? This tutorial covers some of the primary techniques of "dating" (in the geological, not the romantic, sense!).

9750_Carbon_14_dating_2.html

9749_Carbon_14_dating_1.html

9752_K_Ar_dating_calculation.html

9751_Potassium_argon_K_Ar_dating.html

9748_Chronometric_revolution.html