you all think my titles are confusing so I wrote this

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Across
  1. 3. crystal
  2. 4. piece of land
  3. 7. baked earth
  4. 8. alien
  5. 9. science of earth
Down
  1. 1. a raised flat mound of earth
  2. 2. surrounded by land
  3. 5. surface of earth
  4. 6. a person who studied earth
  5. 10. study of earth