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Across 2. the movement of people from rural areas to cities. 4. the clearing of forests. 6. a long period without rain. 8. The study of science. 9. the turning of fertile land into desert. 10. The chemicals used to kill insects on plants.

Down 1. pacts among nations to protect the environment.(MEA) 3. is the release of wastes such as chemicals or harmful gases into the air, water, and soil. 5. areas were cities have grown so large they run into each other. 7. the special environments required for particular organisms to live.