Relative absolute dating techniques archaeology
The latter have generally been available only since 1947.
Many absolute dating techniques take advantage of radioactive decay, whereby a radioactive form of an element is converted into a non-radioactive product at a regular rate.
There are two techniques for dating in archaeological sites: relative and absolute dating.
Relative dating stems from the idea that something is younger or older relative to something else.
When it comes to dating archaeological samples, several timescale problems arise.
For example, Christian time counts the birth of Christ as the beginning, AD 1 (Anno Domini); everything that occurred before Christ is counted backwards from AD as BC (Before Christ).
Natural disasters like floods can sweep away top layers of sites to other locations.
Radiocarbon is then taken in by plants through photosynthesis, and these plants in turn are consumed by all the organisms on the planet.
So every living thing has a certain amount of radiocarbon within them.
Absolute dates are also relative dates, in that they tell which specimens are older or younger than others.
Absolute dates must agree with dates from other relative methods in order to be valid.