Realtive and Absolute Dating Flashcards
Absolute Dating
It gives an actual age reported as years before present.
Relative Dating
It does not give an exact age. It simply consists of just knowing which object is older or younger.
The Law of Superposition
This states that the older layers lie underneath the younger layers in undisturbed contexts.
Radiocarbon Analysis
It measures the amount of carbon 14 in charcoal, wood, shell, and bone. When an organism dies carbon 14 decays at a known rate, so the amount of carbon 14 left in the organism tells you how long it has been since it died.
Potassium-Argon Analysis
This analysis can date rocks that have been heated, either by a volcano eruption, natural fire, or human hearth. ( used up to 4.6 billion years burned up to 100,000 years)
Electron Spin Resonance
It measures the number of trapped electrons in bone or shell. This allows scientists to determine the material’s last exposure of sunlight ( before buried).