Energy Crossword - read and solve the clues!

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Across
  1. 3. A form of energy that relies on the sun.
  2. 5. Main source of energy on Earth.
  3. 7. Type of energy that allows us to power our household appliances.
  4. 9. Used by a doctor to see your bones.
Down
  1. 1. Required by cars so that they can drive.
  2. 2. Energy is defined by the ability to _______.
  3. 3. Type of energy that is seen in lightning storms.
  4. 4. Used for everyday activities.
  5. 6. Energy given off by the sun that you can feel.
  6. 8. Energy given off by the sun that you can see.