The Geologic Record
Content Statement: Evidence of the dynamic changes of Earth's surface through time is found in the geologic record.
Geologic Time Scale
Geologic Time Scale Interactive (Field Museum)
Geologic Time (Berkeley)
Inferring the age of rocks...
Carbon-14 Video Clip: Radioactive Decay of Carbon-14
Source: NOVA: "Hunting the Elements" This media asset was excerpted from NOVA: "Hunting the Elements."
Half-Life