Across
- 4. a state of complete emptiness or destruction.
- 7. solid rock underlying loose deposits such as soil or alluvium.
- 8. is 97% of water on Earth
- 10. a whole formed by combining several (typically disparate) elements.
- 12. the commercially valueless material in which ore is found
- 13. the presence in or introduction into the air of a substance which has harmful or poisonous effects.
- 14. situations in which building occupants experience acute health and comfort effects that appear to be linked to time spent in a building, but no specific illness or cause can be identified.
- 15. can be used infinately
Down
- 1. a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action
- 2. a substance that pollutes something, especially water or the atmosphere.
- 3. when used it is gone forever
- 5. originally made by Earth
- 6. the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
- 9. a naturally occurring solid material from which a metal or valuable mineral can be profitably extracted
- 11. refers to total fellings and not only to timber removed for own consumption and use.