Sort 17 Vowel Alternation: Long to Short

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Across
  1. 2. existing in or formed by nature (opposed to artificial)
  2. 3. the material world, especially as surrounding humankind and existing independently of human activities
  3. 7. the act or work of revising
  4. 8. a hollow in the earth, especially one opening more or less horizontally into a hill, mountain, etc
  5. 9. a form of the possessive case of I used as a predicate adjective
  6. 11. accuracy; exactness
  7. 12. characterized by tenderness, compassion, and sympathy for people and animals, especially for the suffering or distressed
  8. 13. any of a class of substances occurring in nature, usually comprising inorganic substances, as quartz or feldspar, of definite chemical composition and usually of definite crystal structure, but sometimes also including rocks formed by these substances as well as certain natural products of organic origin, as asphalt or coal
  9. 16. to amend or alter
  10. 17. a number of things or persons sharing a particular characteristic, or set of characteristics, that causes them to be regarded as a group, more or less precisely defined or designated; class; category
  11. 19. any hollow place; hollow
  12. 20. physically active and strong; good at athletics or sports
  13. 22. all human beings collectively; the human race; humankind
Down
  1. 1. to set on fire; kindle
  2. 4. a person trained or gifted in exercises or contests involving physical agility, stamina, or strength; a participant in a sport, exercise, or game requiring physical skill
  3. 5. of the nature of or involving crime
  4. 6. definitely or strictly stated, defined, or fixed
  5. 10. to take air, oxygen, etc., into the lungs and expel it; inhale and exhale; respire
  6. 11. (of persons, manners, disposition, etc.) socially acceptable or adept; polite; amiable; agreeable
  7. 14. the act or fact of igniting; state of being ignited
  8. 15. (used as a polite addition to requests, commands, etc.) if you would be so obliging; kindly
  9. 17. of the nature of or serving as a type or representative specimen
  10. 18. the air inhaled and exhaled in respiration
  11. 21. an action or an instance of negligence that is deemed injurious to the public welfare or morals or to the interests of the state and that is legally prohibited