Earth Day Crossword Puzzle

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Across
  1. 3. Substances released into the air and are measured by their concentrations, or parts per million, in the atmosphere.
  2. 5. A blanket of gases that surrounds Earths
  3. 7. A geographic area where plants, animals, and other other organisms, as well as weather and landscapes, work together to form a bubble of life
Down
  1. 1. A sum total of all the living and non-living elements and their effects that influence human life.
  2. 2. Trash, wastepaper, or garbage lying scattered about.
  3. 4. A mixture of various decaying organic substances, as dead leaves or manure, used for fertilizing soil.
  4. 6. Produced or operated by the action of the suns light or heat.