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  1. Lahar
  2. natural hazard
  3. debris flow
  4. Liquefaction
  5. Landslide
  6. mudflow
  7. slump
  8. mass movement
  9. failure surface
  10. undercutting
  11. angle of repose
  12. Rockfall
  13. Creep
  14. talus arpon
  15. head scarp
  16. debris slide
  17. solifluction
  18. Avalanche
  19. debris fall
  20. rock slide
  1. a A thick slurry formed when volcanic ash and debris mix with water, either in rivers or from rain or melting snow and ice on the flank of a volcano.
  2. b The type of creep characteristic of tundra regions; during the summer, the uppermost layer of permafrost melts, and the soggy, weak layer of ground then flows slowly downslope in overlapping sheets.
  3. c The detachment or sliding horizon on which downslope movement of rock or debris occurs.
  4. d The distinct step along the upslope edge of a slump where the regolith detached.
  5. e A sudden downslope movement of material consisting only of regolith.
  6. f A turbulent cloud of debris mixed with air that rushes down a steep hill slope at high velocity; the debris can be rock and/or snow.
  7. g Excavation at the base of a slope that results in the formation of an overhang.
  8. h A situation or setting caused by natural processes that can result in damage to society.
  9. i A sudden movement of rock and debris down a nonvertical slope.
  10. j A downslope movement of mud mixed with larger rock fragments.
  11. k The angle of the steepest slope that a pile of uncemented material can attain without collapsing from the pull of gravity.
  12. l The gravitationally caused downslope transport of rock, regolith, snow, or ice.
  13. m The transformation of seemingly solid sediment into a liquid-like slurry, in response to ground shaking.
  14. n The gradual downslope movement of regolith.
  15. o A sudden collapse of disaggregated material on a steep slope.
  16. p A sudden collapse of bedrock down a steep slope.
  17. q A sudden downslope movement of rock.
  18. r A wedge-shaped pile of rock fragments that accumulates at the base of a cliff.
  19. s Downslope movement in which a mass of regolith detaches from its substrate along a spoon-shaped sliding surface and slips downward semicoherently.
  20. t A downslope movement of mud at slow to moderate speed.