Why do we use carbon 14 for carbon dating Free xxx sex online sex facebook chat
At any given moment all living plants and animals have approximately the same percentage of carbon-14 in their bodies.
When a plant or animal dies it stops bringing in new carbon-14.
Carbon-14 formed in the atmosphere can combine with oxygen to form carbon dioxide (CO2).
Although the half-life of carbon-14 makes it unreliable for dating fossils over about 50,000 years old, there are other isotopes scientists use to date older artifacts.
These isotopes have longer half-lives and so are found in greater abundance in older fossils.
Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.
This technique is widely used on recent artifacts, but teachers should note that this technique will not work on older fossils (like those of the dinosaurs which are over 65 million years old).