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Across 4. magma that has erupted from a volcano or a fissure (crack) in the Earth's crust 11. the wearing down and breaking of hard rock by natural forces like wind, ice, plants, and burrowing animals 12. a method of reducing erosion in which farmers plant crops on flat terraces cut into hillsides 13. a mixture of small pieces of rock and material from living things 14. the small pieces of rock that form when rock breaks down 15. the solid layer of Earth's surface 17. rock that formed when other rock is chemically changed deep inside Earth by heat and pressure 19. rock that forms from layers of soil and sediment that are squeezed together 21. a boundary where plates slide past each other 22. a quality of something, such as color or hardness 23. the middle layer of Earth, the thickest layer below the crust, made up of hot, dense rock that tectonic plates float on 25. the remains, trace, or print of an organism that lived in a past age 26. the thicker, liquid layer of Earth's core 28. a boundary where plates push together 29. a place where tectonic plates meet 31. an opening in Earth's crust through which melted rock, gases, and ash can be released 32. one of Earth's surace features 33. the sudden movement of weathered rocks and soil downhill

Down 1. a huge sheet of ice that moves slowly over land 2. molted rock below or within the Earth's crust 3. one of the large, slowly moving pieces of Earth's crust 5. a break in Earth's crust where movement can occur 6. the dropping of material by water, wind, or glaciers 7. the outermost layer of Earth; upper layer on which we live (broken into pieces called tectonic plates that float on next surface, the mantle) 8. the process by which weathered rock is picked up and moved 9. a solid, nonliving mineral found in the ground 10. a boundary where two plates move away from each other 16. a mountain formed where two continental plates push together, bending and lifting layers of rock 18. rock that forms when melted rock cools and hardens 20. a method of reducing erosion in which farmers plow across the sides of hills instead of down their slopes 24. the land near a river where water from a flood slows down and drops the sediment it is carrying 27. the shaking of Earth's surface when pieces of Earth's crust move along a fault 30. a solid, nonliving material made up of one or more materials