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Physical Environment > Alpha Radioactivity |
This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
| Large atoms such as uranium are too large to hold themselves together. They contain too many protons, which all repel each other, so the nucleus breaks apart into an alpha particle and a nucleus. This type of radioactivity keeps the Earth and other planets warm. Because the rate of decay is predictable, it also allows us to date rocks and other materials. | ||
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Physical Environment > Alpha Radioactivity |
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