Across
- 4. substance that makes plant green
- 8. most abundant element present in air
- 10. underground layer of water bearing permeable rock
- 12. the worlds largest biome
Down
- 1. standard period of no water
- 2. mixture of smoke and fog
- 3. opening in the earth crust from which lava flow
- 5. sweet liquid inside a flower
- 6. the world's cleanest country
- 7. any substance that evaporate quickly
- 9. offspring of male donkey and female horse
- 11. system comprising ecosystem and organisms