The process of spontaneous breakdown of an atomic nucleus and the release of energy and matter from the nucleus is called Radioactive Decay. Radioactive isotopes are elements with a very unstable nucleus. They are always trying to stabilize and to do that they release energy and transmute into other elements which are stable. Transmutation can occur in nature and by artificial means.
Based on the former evidence, the answer to this question is:
Radioactive decay happens when one kind of atom becomes another kind.
Carbon-14 decays into nitrogen-14.
Radioactive elements occur in nature.
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When water is being evaporated, that is the atmosphere and hydrosphere working together.
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it helps if you start with a setting.
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it gives the reader a sense of where the tale is and what time what was going on
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Examples: team, crew, flock, pack, committee, group, panel, staff
C. "Wearing a wet half smile, her ancient dog sullenly waddled toward me like Yoda greeting Luke." —Student essay