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Across 3. With a huge emotional impact (like a tsunami). 5. A gift of money to pay for a poor person's education. 7. Counting populations (usually every 10 years). 8. Very, very dirty. 10. Metal in the ground before it has been extracted and purified. 11. Describing the skill of negotiating between countries. 14. A private (amateur) army. 17. Fall steeply. (The opposite of 'soar'.) 18. Describing a plant that is dry and dying. 19. Natural resistance against a disease (often after a vaccination).

Down 1. A limited, single issue election, common in Switzerland and for deciding Brexit. 2. The range of plants and animals in a habitat. 4. Describing a quick and lively sense of humor. 6. Strict state control of the media. 9. Extremely unfriendly. 12. Use your hands skillfully to change something's shape or form. 13. Describing an unfair election. 'It was __________'. 15. A dictatorial government.'The North Korean _________'. 16. A woman whose husband has died.