DEFORESTATION

5. The presence in or introduction into the environment of a substance which has harmful or poisonous effects.
7. The action of clearing a wide area of trees.
8. The process of cutting down trees.

1. The remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form.
2. The variety of plant and animal life in the world.
3. No longer existence.
4. A place of tall trees and full of biodiversity.
6. The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.