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Across
  1. 4. The type of renewable energy generated from the sun. (6 letters)
  2. 5. A natural resource obtained by cutting down trees. (5 letters)
  3. 7. A resource that is often overused and leads to depletion when used excessively. (7 letters)
  4. 8. The process of making soil fertile again by using natural or artificial means. (7 letters)
Down
  1. 1. The process of breaking down dead organic matter to release nutrients into the soil. (12 letters)
  2. 2. A part of the Earth that includes the atmosphere, hydrosphere, and lithosphere. (7 letters)
  3. 3. The process of removing harmful substances from the air, water, or soil. (8 letters)
  4. 6. A forest area that receives high rainfall and has dense vegetation. (5 letters)