Across
- 5. layer in which convection currents flow
- 8. layer of soil with clay and little humus
- 10. management of soil to prevent its loss
- 12. center of earth
- 14. process in which wind moves surface materials
- 18. measure of how well soil supports growth
- 20. transfer of energy through empty space
- 21. this type of stress pushes rock in opposite directions
- 22. layer of solid hot rock divided into layers inside the earth
- 25. ash, cinders, bombs build up in a steep pile; type of volcano
- 27. large area of flat land high above sea level
- 28. result of sea floor spreading apart along both sides
- 29. most common type of volcano
- 30. convection currents cause plates to move; theory
- 33. point under earth's surface where rock breaks under stress
- 34. solid layer of rock that is basic part of soil
Down
- 1. edges of plates meet at these lines
- 2. this water feature forms on deep mountain slopes
- 3. dark colored substance in soil; increases fertility
- 4. active channel of water that erodes land around it
- 6. another name for soil layer
- 7. transfer of heat energy by movement of heated fluid, as in earth's mantle
- 9. made mostly of the metals iron and nickel
- 10. transfer of heat energy by direct contact
- 11. travel away from the focus of the earthquake
- 13. type of boundar where mid-ocean ridge occurs
- 15. layer of solid rock that forms earth's skin
- 16. type of weathering where rock is physically broken down
- 17. break in the earth's crust
- 19. huge hole left by collapse of volcanic mountain
- 23. long tube in ground that connects magma chamber to earth's surface
- 24. living organism which breaks down remains
- 26. this type of earth stress makes reverse faults
- 28. this results from movements in inner core of earth
- 31. layer of humus, clay, and minerals
- 32. minimum number of seismograph stations required to determine location of earthquake