Across
- 4. trash that is left in an open or public place
- 6. able to be maintained at a certain level
- 7. having no living members, no longer in existence
Down
- 1. maintain in its original or existing state
- 2. a layer of gas that surrounds a planet
- 3. a gas made up of 3 oxygen molecules, part of the atmosphere
- 5. the natural home of an animal, plant, or other organism
- 8. manure used to fertilize plants