The extreme temperatures of the magma would just destroy the bones.
So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash.
The number used to identify the isotope refers to the total number of particles in the nucleus of each atom.
Some of the different kinds of radioactive atoms used to date objects are shown in the following table: Potassium-Argon Dating Potassium atoms are used to date rocks that have formed from molten rock. Argon is an inert gasit does not chemically bond to other atoms.
This process is called radiometric or radioactive dating.
Radiometric dating is possible because the radioactive decay of large numbers of radioactive atoms follows a predictable pattern.
Unfortunately, these elements don't exist in dinosaur fossils themselves.
All radioactive atoms decay to become a more stable kind of atom.
The original radioactive atom is known as a parent isotope, while the atom produced by the decay process is known as a daughter isotope. For example Uranium-235 and Uranium-238 are both Uranium atoms with the same number of protons, but they have a different number of neutrons.
In addition, the oldest known moon rocks are 4.5 billion years old.
Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age.