GENERAL GEOLOGY

Detailed explanation-1: -The rubidium-strontium method has been a popular method to determine the absolute age of geological processes. When discussing decay rates, scientists refer to “half-lives”-the length of time it takes for one-half of the original atom of the radioactive isotope to decay into an atom of a new isotope.

Detailed explanation-2: -Absolute age is the numeric age of a layer of rocks or fossils. Absolute age can be determined by using radiometric dating.

Detailed explanation-3: -The rate of decay is conveniently expressed in terms of an isotope’s half-life, or the time it takes for one-half of a particular radioactive isotope in a sample to decay.

Detailed explanation-4: -After the death of the organism, the amount of radiocarbon gradually decreases as it reverts to nitrogen-14 by radioactive decay. By measuring the amount of radioactivity remaining in organic materials, the amount of carbon-14 in the materials can be calculated and the time of death can be determined.