Across
- 3. A permanent change in the Earth’s weather conditions
- 4. Power obtained by the energy of the wind
- 6. The action of planting seeds
- 7. The process of making air, water, land etc dangerously dirty and not suitable for people to use
Down
- 1. A general increase in world temperatures caused by increased amounts of carbon dioxide around the Earth
- 2. The cutting or burning down of all the trees in an area
- 5. The process of treating used objects or materials so that they can be used again