have daniel radcliffe and emma watson dating - Radiometric dating for kids
The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.
Radiometric dating for kids
Here he can see that some curved sedimentary rocks have been cut vertically by a sheet of volcanic rock called a dyke.
It is clear that the sedimentary rock was deposited and folded before the dyke was squeezed into place.
For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.
Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.
After the passage of two half-lives only 0.25 gram will remain, and after 3 half lives only 0.125 will remain etc.