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Across 1. Thick rock layer around the earth's core 2. Flat plain sometimes formed at the mouth of a river 3. An air mass 8. Movement of weathered gravel, soil, etc. 10. Theory that says the earth's outer shell is not solid rock 11. Huge, slow-moving ice field 12. Electric communication 14. Condition of the bottom atmosphere over a long time 17. Without it, there would be only rock, not in soil 19. Windblown deposits of mineral-rich dust 21. Surrounded by water on three sides 23. Mountain range reaching into the Northeast 27. Telegraph inventor 29. Average number of people in a given area is its population____ 31. Raised, mostly level landform 32. Circle of volcanos surrounding the Pacific Ocean 34. Outer layer of the earth 35. Low place between mountains 36. Florida wetlands 37. Cloth-related industry 38. Places with similar characteristics 39. Dry, treeless plain that sprouts grass or moss when the ground thaws 40. Condition of the bottom atmosphere over a short time 41. Darl colored organic material

Down 4. Where a place is in compared to other places 5. Water that falls to the earth as rain, sleet, snow, etc. 6. The earth's spinning on its axis 7. One trip around the sun for the earth 9. Mostly flat area with few elevation changes 13. Landforms and other surface features 15. Breakdown of rock into smaller and smaller pieces 16. Formed by decaying plants and animals over time 18. First man-made canal in America 20. Very deep valley with very deep sides 22. Artificial waterway 24. Half of the globe 25. Type of weather just north of Tropic of Cancer 26. Residential area just outside of a city 28. Average number of days between spring and fall frosts 30. Load of rock and sand carried by a river 33. God after whom volcanos are named