Green Group: y to ies plural

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Across
  1. 1. the opposite of low
  2. 3. a book containing words in alphabetical order
  3. 5. something newly found
  4. 7. an empty space within a solid object
  5. 8. talent or skill in a particular area
  6. 10. a nation with its own government
Down
  1. 2. a system of millions or billions of stars
  2. 4. buildings containing collections of books
  3. 6. groups of people who are related to one another
  4. 9. in the middle of