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Contents of 7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

• Radioactivity
• the energy and subatomic particles released as one element transforms into another due to changes in the number of protons and neutrons.
• Isotopes - atoms of the same element with the same number of protons, but a different number of neutrons
• Radioactive decay - a change in the number of protons, neutrons, or both that transforms an unstable isotope towards a stable one

Fig 7.16