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Across 3. A living fossil 7. The loss of trees in a forest 8. To completely remove 10. Related to coordinates 12. A disastrous effect that causes ice to melt from ice caps and raises global temperature 17. Large reptiles once dominated earth 18. Animals with shell as an armor 19. Clams, oysters...

Down 1. An invisible shield that surrounds the earth 2. An organnization dedicated to protecting wildlife 4. Spiders! 5. A source of energy 6. A stretch of habitat that connects national parks and wildlife reserves to each other, continuously, like beads on a string. 9. A species that occupies a rare habitat that, if protected, will also save many other species 11. To re-establish a forest 13. The belt that surrounds our planet 14. Dying out 15. Related to coordinates 16. Only found in one place on earth.