Across
- 5. The action of clearing a wide area of trees
- 6. The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
Down
- 1. the condition of being populated with excessively large numbers.
- 2. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
- 3. Operations associated with the production of oil or gas from reservoir access holes drilled from underground shafts or tunnels.
- 4. The activity or business of felling trees and cutting and preparing the timber.