Hard Level: General

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Across
  1. 1. What is the largest planet in the solar system?
  2. 4. What do children expect in their stockings at Christmas?
  3. 6. What orbits around the Sun
  4. 7. What is the most abundant chemical element in the universe?
  5. 8. The largest ocean in the world
Down
  1. 2. What biological process converts solar energy into food?
  2. 3. What is the theory that suggests the universe is expanding?
  3. 5. The Greek philosopher who said "Know thyself"