Studies using radiometric dating Sex chat eng
Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.
When a tree is cut down, these periods are exhibited in a cross section of the trunk in the form of rings.
(Creationists claim that argon escape renders age determinations invalid.
However, any escaping argon gas would lead to a determined age younger, not older, than actual.
The use of 14C in meteorite dating is solely based on its production by cosmic rays (and for terrestrial samples, with its production in the atmosphere).
There are well-known methods of finding the ages of some natural objects.An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope.For example, uranium-238 is an isotope of uranium-235, because it has 3 more neutrons in the nucleus.Thus, although "extinct", these nuclides are present in meteorites, but produced by a more recent process."The idea that Rb-Sr is the most used chronometer for meteorites is largely based on work done 10-30 years ago.
The sum of protons plus neutrons is the mass number.