cross work puzzle

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Across
  1. 2. decayed organic material used as a plant fertilizer.
  2. 5. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O2) in having three atoms in its molecule (O3).
  3. 7. protect (something, especially an environmentally or culturally important place or thing) from harm or destruction.
  4. 8. a species, family, or other group of animals or plants) having no living members; no longer in existence.
  5. 10. the surroundings or conditions in which a person, animal, or plant lives or operates.
Down
  1. 1. the envelope of gases surrounding the Earth or another planet.
  2. 3. maintain (something) in its original or existing state.
  3. 4. the natural home or environment of an animal, plant, or other organism.
  4. 6. contaminate (water, air, or a place) with harmful or poisonous substances.
  5. 9. relating to or determined by the sun.