Arctic Threats

2. the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
3. make full use of and derive benefit from (a resource).
8. a viscous liquid derived from petroleum, especially for use as a fuel or lubricant.
9. relating to chemistry, or the interactions of substances as studied in chemistry.
11. a body of water or air moving in a definite direction, especially through a surrounding body of water or air in which there is less movement.
12. worldwide.
13. a statement of an intention to inflict pain, injury, damage, or other hostile action on someone in retribution for something done or not done.
16. the strength and vitality required for sustained physical or mental activity.
17. animal species.
18. opposite of short.
19. a word that describes the temperature between cool and hot.

1. cause or allow (liquid) to flow over the edge of its container, especially unintentionally.
4. contaminate with harmful or poisonous substances.
5. opposite of decrease.
6. produce (a hole) in something by or as if by boring with a drill.
7. make or become different.
10. relating to or found in the sea.
14. the area of variation between upper and lower limits on a particular scale.
15. the north most part of the Earth.
17. plant species.