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Across 2. land within urban areas that is set aside for scenic and recreational enjoyment, such as City Park or Town Point Park 6. problem in Haiti due to too many trees being cut down than can be replaced 7. long-term Pacific Ocean change in warm and cold water masses; occurs 20-30 years 9. when rain occurs on one side of the mountain but not the other 11. how much water flows through soil 12. when atoms split; atomic bomb utilized this 14. location of good ozone 15. layer of solid rock 19. water that is drinkable 24. winds that blow predominantly in one direction 27. human activity or climate change make arid (dry) areas more desert-like; this happened to Lake Chad 29. area of open land often used for farming 30. this describes a crop that can be produced in a large amount with little negative impact on the environment 32. krill eat a small amount of DDT; small fish eat many krill increasing the DDT in the small fish; DDT is greatest at the level of a bird eating a large fish 34. cutting down only mature or dying trees 35. layer of the thermosphere where ions can emit photons of light known as aurora borealis or australias 37. there are about 50 species of animals that have been raised for human use or consumption 38. oil, petroleum, coal; nonrenewable resources 39. converts mechanical energy into electrical energy 40. movement of warmth by wind 41. area in which water travels downward to add to an aquifer 42. coldest layer of the ozone 43. virus or microorganism that causes disease

Down 1. mixture of decomposing organic matter used as a fertilizer and soil conditioner; guy on Bill Nye video had a toilet that collected this 3. raising aquatic organisms for human use or consumption 4. site of world's worst nuclear reactor accident in the Ukraine in 1986 5. planting crops with the flow of the shape of the land; helps prevent erosion 6. saves on 80% of water lost in normal spray irrigation 8. the basic facilities of a country or region, such as roads, bridges, sewers, and hospitals 10. how many spaces soil has 13. transfer of heat energy to an object 16. scenic or recreational space that is left in its natural condition 17. layer of soil with organic matter, living organisms, and rock particles 18. accumulation of salts in soil; problem in California 20. warm phase of ENSO in Pacific Ocean in which surface-water temperature becomes unusually warm 21. when atoms fuse together 22. warming of the surface and lower atmosphere of Earth that occurs when carbon dioxide, water vapor, and other gases absorb UV rays 23. area in city where temperature is higher than in surrounding rural areas 25. this group of people were hurt during the green revolution because they couldn't keep up with the new technology of farming 26. period that started in the 1970's: greater crop variety, more technology, and more chemicals, such as fertilizers 28. land that can be farmed 31. last true layer of the atmosphere where both ions and satellites are (distinguished in two recognized layers) 33. a multitude of people move into cities because more jobs are there 36. distance north and south of equator; seasons and daylight change further from the equator