Environment crossword

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Across
  1. 2. The deposit of small ice crystals formed on surface when temprature falls below freezing
  2. 4. Thermal energy in earth crust.
  3. 7. To treate something that has already been used
  4. 9. Over flowing of water due to rain
  5. 10. Natural home
Down
  1. 1. To keep safe from destruction
  2. 3. Make or cause to decay naturally
  3. 5. An area of land where large amount of wate material are buried under earth
  4. 6. The part of Earth's surface is not covered with water
  5. 8. Blue planet