NATURAL RESOURCES

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Across
  1. 2. It occurs in elemental form
  2. 5. Vaporization that occurs on surface
  3. 7. A wonder liquid
  4. 8. Absorbs sun's ultraviolet rays
Down
  1. 1. The breath of life
  2. 3. We inhale it
  3. 4. Moving air
  4. 6. Action of making air etc. dirty and dangerous