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Across 4. Places where fish are caught or bred for commercial purposes. 5. To bring in merchandise from a foreign country for use, sale, or service. 6. A union from the process of unifying or uniting. 9. Sands used for cement, glass, and animal feed supplements. 10. A white, bitter, alkaloid obtained from the cinchona bark and used for medicine. 12. An extensive sandbank, covered by shallow water between England and Denmark. 15. "The sea in the middle of the land." 16. Areas on the earth's surface which are important to the military. 17. A wide channel linking two large bodies of water; or separating an island from the mainland.

Down 1. A termination of existence or operations; death; to decease. 2. The process of making or becoming democratic. 3. Pockets of the sea extending to the land. 7. A sudden, widespread disaster. 8. The study of the influence of geography on politics. 11. To ship commodities to other countries for sale or exchange. 13. A lobster without large claws found in the mediterranean. 14. A long, narrow area with a barometric pressure; a long channel of rainwater.