Science Crossword

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Across
  1. 1. (Of a species, family, or other group of animals or plants) having no living members; no longer in existence
  2. 2. Protect (something, especially an environmentally or culturally important place or thing) from harm or destruction
  3. 4. Decayed organic material used as a plant fertilizer
  4. 6. Relating to or determined by the sun
  5. 8. The production and discharge of something, especially gas or radiation
  6. 9. Trash that is left lying in an open or public place
Down
  1. 1. The branch of biology that deals with the relations of organisms to one another and to their physical surroundings
  2. 3. A biological community of interacting organisms and their environment
  3. 5. The gases surrounding the earth or another planet
  4. 7. A place to dispose of refuse and other waste material by burying it and covering it over with soil, especially as a method of filling in or extending usable land