Distinguish between relative dating and absolute dating
Radiocarbon dating measures radioactive isotopes in once-living organic material instead of rock, using the decay of carbon-14 to nitrogen-14.Because of the fairly fast decay rate of carbon-14, it can only be used on material up to about 60,000 years old.Some measure the decay of isotopes more indirectly.
Others measure the subatomic particles that are emitted as an isotope decays.
Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods.
Relative dating uses observation of location within rock layers, while radiometric dating uses data from the decay of radioactive substances within an object.
Continue Reading Relative dating observes the placement of fossils and rock in layers known as strata.
Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.