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Across 2. defrost or melt 4. remarkable person, thing or event. 5. rain and snow 7. open to harm 11. a layer of the ground, in the Arctic, that is always frozen 13. undomesticated animals that live in forests and jungles 14. the line above which trees don't grow 15. an area of the Arctic were nothing grows, due to the extreme cold

Down 1. a type of tree that loses its leaves every year 3. the northern lights 6. the smallest chemical unit; an extremely amount of a thing 8. soil that holds a lot of water and is very soft 9. tiny bits of water that float in the air 10. hit with force when moving 12. the time of day between day and night; also called sunset or dusk