Review-Lesson 6 Stars #1

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Across
  1. 4. It is the splitting of atoms to release energy
  2. 5. It is the process that forms heavier elements
  3. 8. The gas that makes up most of the Sun.
  4. 9. In the equation E=mc2, E represents it.
  5. 11. It forms when the star's core heats after after it gets smaller
Down
  1. 1. It is the combining of atoms to release energy
  2. 2. The Sun has existed this long. 5 ________ years
  3. 3. A key ingredient for nuclear fusion to happen
  4. 6. In the equation E=mc2, c represents it.
  5. 7. The gas required for combustion to occur
  6. 10. In the equation E=mc2, m represents it.