1. RELATIVE AND ABSOLUTE DATING

2. How can absolute, or numerical dating help us to determine geologic history?

3. If we know the age of
rock by absolute dating,
then we can date index
fossils and once that
happens we can
associate fossils with
clear dates.

4. Radiocarbon analysis, or carbon 14 analysis, measures the amount of carbon 14 in charcoal, wood, shell, or bone.
Carbon 14 decays at a known rate when an organism dies, so the amount of carbon 14 left in the organic material can tell you how long it has been since it died. 
Radiocarbon dating is only really accurate for materials up to 50 thousand years old.