The following chart shows this concept with a brief description of each age represented.The age of a rock in years is called its absolute age.First, we must understand they are dating the rocks and other materials found on the Earth to determine this.

two types of relative dating-52

A chemical element consists of atoms with a specific number of protons in their nuclei, but different atomic weights owing to variations in the number of neutrons.

Atoms of the same element with differing atomic weights are called isotopes.

In Relative Time dating a specific age in years is not given.

This type of dating puts events in their correct chronological order based upon the sedimentary layer in which an object is found.

Until the advent or discovery of Radiometric dating, a type of Absolute time dating, there was no way to verify the accuracy of the relative ages of materials found in the various layers of sedimentary rocks.

Rocks which have been dated utilizing one of the various methods of actual Time dating, can be incorporated into a relative time scale.

Radioactive decay is a spontaneous process in which an isotope (the parent) loses particles from its nucleus to form an isotope of a new element (the daughter).

Most radioactive isotopes have a rate of decay that is much too fast to be of any use in determining the geologic age of materials.

This happens because of upheaval, earthquakes, or other large earth movements.

The Principle of Lateral Continuity: Because rock layers cover large areas of the Earths surface, scientists can relate layers in one location to another.

With this combination of the two types of dating methods, geologists can relatively, accurately determine the date of earth events and much of the time line associated with the evolution of life on the planet.