The discovery of radioactivity was vital as it helped scientists in determining the exact age of some rocks.
Radioactivity refers to the release of energy from the decay of the nuclei of atoms and isotopes. It should be noted that the dates for most rocks are gotten through radiometric methods.
Through radioactivity, scientists can determine the age of rocks in years. Dates were assigned to the scale divisions. An example is Jurassic that began about 200 million years ago.
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