Earth Day

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Across
  1. 3. the process of replanting an area with trees.
  2. 5. wild animals collectively; the native fauna (and sometimes flora) of a region.
  3. 7. a colourless, transparent, odourless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.
Down
  1. 1. the surroundings or conditions in which a person, animal, or plant lives or operates.
  2. 2. the phenomena of the physical world collectively, including plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations.
  3. 4. the weather conditions prevailing in an area in general or over a long period.
  4. 6. the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.