The decay of radioactive elements such as uranium creates heat, especially in the earth's crust.
Radioactive elements are created of atoms whose nuclei are unstable and give off atomic radiation as part of a process of achieving stability. The emission of radiation alters radioactive atoms into another chemical element, which may be stable or radioactive such that it experiences further decay.
During this procedure, energy is elevated. One state of this energy is alpha radiation.
Radioactive decay is a process where the atomic nuclei of radioactive isotopes release fast-moving particles and energy and the identity of an atom changes.
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