The age of the remains of plants, animals, and other organic material can be determined by measuring the amount of carbon-14 contained in that material.
Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.
Eventually, the entire ecosystem (community of plants and animals) of the planet, including humans, is filled with a concentration of carbon-14.
As long as an organism is alive, the supply of carbon-14 is replenished.
The older the pottery, the brighter the light that will be emitted.
Using thermoluminescence, pottery pieces as old as 100,000 years can be dated with precision. Known as dendrochronology (pronounced den-dro-crow-NOL-o-gee), tree-ring dating is based on the fact that trees produce one growth ring each year.