Diagrams for relative dating
For purposes of relative dating this principle is used to identify faults and erosional features within the rock record.
Then, by applying the Principle of Cross-Cutting we are able to relatively date those processes.
"You'll see the explosion reflected off the moon." The graphics immediately above and below are from a Feb 09 PDF (3 meg) from Argonne Labs. Widespread multiple failures would take longer to repair.
Try to explain to somebody why you cannot heat a nursing home or keep a hospital warm." -- Ed Gray, Missouri State Emergency Management Agency (SEMA) Riverfront Times An earthquake in the middle of the country, along the precarious New Madrid fault, could have enormous fiscal and energy consequences.
"Virtually every natural gas pipeline in the nation is built over that fault," Geller says. From below: several high voltage towers and transmission lines.
It wasn't until well into the 20th century that enough information had accumulated about the rate of radioactive decay that the age of rocks and fossils in number of years could be determined through radiometric age dating.
This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.
This company (above) delivers Billions of cubic feet of gas per year through 19 major pipelines.