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What is atomic fusion?

  1. The joining of atomic nuclei to form heavier nuclei

  2. One of a group of "minor planets" between Mars and Jupiter

  3. The breaking down of an atomic nucleus into two or more parts with a great release of energy

  4. One of a group of "minor plants" between Mars and Jupiter

The correct answer is: The joining of atomic nuclei to form heavier nuclei

Atomic fusion is the joining of atomic nuclei to form heavier nuclei through the release of energy. This process is what powers stars and is also used in nuclear power plants. Option B is incorrect, as it refers to "minor planets" in our solar system, not atomic fusion. Option C is incorrect as it describes nuclear fission, which is the breaking down of an atomic nucleus. Option D is incorrect as it also refers to "minor planets," not atomic fusion.