Earth

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Across
  1. 4. the state of being clear of trees.
  2. 8. a visible suspension of carbon or other particles in air, typically one emitted from a burning substance.
  3. 9. a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluid
  4. 10. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
Down
  1. 1. machinery and equipment developed from such scientific knowledge.
  2. 2. a large, destructive fire that spreads quickly.
  3. 3. rain/Rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes.
  4. 5. the supply of electric current to a house or other building for heating, lighting, or powering appliances.
  5. 6. the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
  6. 7. is a release of a liquid petroleum hydrocarbon into the environment due to human activity, and is a form of pollution.