Earth's internal heat energy was generated in the formation of the planet. ... Radioactive elements such as uranium give off particles from their nuclei, which collide with surrounding material, generating heat. Some uranium atoms will be doing this for billions of years.
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Earth's internal heat energy was generated in the formation of the planet. ... Radioactive elements such as uranium give off particles from their nuclei, which collide with surrounding material, generating heat. Some uranium atoms will be doing this for billions of years.