how radiometric dating is used to determine the age of rocks and fossils

Ngauruhoe in the Taupo Volcanic Zone of New Zealand erupted andesite lava flows in and , and avalanche deposits in Atomic nuclei are held together by an attraction between the large nuclear particles protons and neutrons that is known as the "strong nuclear force", which must exceed the electrostatic repulsion between the protons within the nucleus. Every reversal looks the same in the rock record, so other lines of evidence are needed to correlate the site to the GPTS. The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes. For example, there is a specific interval of time, indicated by the red box, during which both the blue ammonite and orange ammonite co-existed. Andrew Snelling explains. The boundary between these periods the K-T boundary is marked by an abrupt change in fossils found in sedimentary rocks worldwide.

HOW RADIOMETRIC DATING IS USED TO DETERMINE THE AGE OF ROCKS AND FOSSILS / janiceclark.net

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