There are a number of such isotopes.
Geological dating requires isotopes with longer half lives than carbon-14 has. It also requires other things, such as that the elements involved do not wash away in water or escape as gas in an unknown manner.
What is usually done is a comparison of the amount of a radioactive element with the amount of the element it decays into. so geological dating is usually done by looking for pairs of elements bound in the rocks. These pairs include:
There is also a dating technique in which tracks markings left by spontaneous fission of uranium are analyzed to compare quantities of uranium-235 and uranium-238.
A link to a Wikipedia article on radiometric dating is given below.
The half-life of all common radio-isotopes for all elements is well-known. The decay of selected elements in a substance (most commonly used is carbon) gives a good estimate of the sample's age, say to within two to five thousand years. When estimating the age of a rock sample that may be 4 billion years old, that is excellent accuracy.
The best known techniques to date materials use carbon isotopes, potassium isotopes, and uranium isotopes. This is called radiometric dating.
Uranium-238 is one radioisotope used to date rocks.
parent and daughter isotopes
It has a long half-life
Carbon-14
True.
True, a wet rock melts at a lower temperature!
very true!!!!!
it is true.
Basaltic rock are true to be extrusive rock
True, if it has a long way to go, then it can not move as fast.
Its true.
no this is not a true story
FALSE. Fossil fuels come from organic matter that has undergone anaerobic decomposition. We suspect that much of our fossil fuel comes from buried plankton and dinosaurs.
it is a true cycle because it the rock cycle
True.
True, a wet rock melts at a lower temperature!
very true!!!!!
it is true
True
it is true.
it is true