Presentation on theme: "Relative and Absolute dating You know your old when……"— Presentation transcript:
Relative and Absolute dating You know your old when……
People have been curious about the earth since the beginning of time. As technology and knowledge have increase more and more information has been uncovered. All agree that the processes ( rain, erosion, weathering, etc.) occurring today are the same ones that occurred millions of years ago. This is known as uniformitarianism. Relative Dating No you cant date your cousin
The concept of relative dating places the ages of rocks and the events that formed them in order, but without exact ages. This is done by comparing the rock layers to each other Several laws are used to explain the relationships: Law of Original Horizontality Law of Superposition Law of Crosscutting Relative dating
Law of Original horizontality states that rock layers are laid down flat, one on top of the other
Law of Superposition states that the oldest rocks are located on the bottom provide there hasnt been any disturbances.
Law of Cross-cutting states that if a rock layer cuts across another layer, the rocks on top are younger.