Sun vocab words

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Across
  1. 2. sunlight provides energy for plants
  2. 4. sun's primary component and fuel
  3. 5. variable measured and observed
  4. 6. educated prediction
  5. 9. variable kept constant throughout
Down
  1. 1. variable changed to observe effect on another variable
  2. 3. hottest and central region
  3. 7. star at the center of solar system
  4. 8. eclipse casts a shadow on Earth