Across
- 4. A day in which people get together in groups to plant trees and take care of them
- 6. A hard black mineral dug out of the ground and burnt to produce heat
- 7. The thick dark liquid from under the ground
- 8. A tall plant with branches
Down
- 1. A natural substance in the earth, like coal, salt, stone and gold
- 2. The world and everything in it, such as plants, animals, oceans, star
- 3. Something like air that burns easily
- 5. The planet that we live on