earthquakes chpt 10 study guide

Water weakens earth materials in which of the

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10. Water weakens earth materials in which of the following ways? A. through interplay with clay minerals B. decreasing the cohesion of rocks C. aiding subsurface erosion D. increasing pressure in pores of rocks and sediments E. All of these are correct. 11. The underlying cause of the Rissa, Norway, landslide was ________________. 12. In California on 12 March 1928, the St. Francis dam failed, unleashing a 185-ft-high wall of water moving 18 mph that killed about 420 people. This was caused by _______________________. 13. Many hill-slope masses are weak due to preexisting geologic conditions such as _________________.
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14. The Vaiont dam disaster in Italy in 1963 was caused by _______________________. A. Sedimentary rock layers folded into a trough-like configuration (syncline) with daylighted beds on each side of the river valley B. water filling the reservoir and saturating the rocks at the top of the slopes, causing elevated pore-water pressures C. the presence of old slide surfaces in the rocks, along with some rock layers containing thin seams of weak clays D. limestone in the hills with numerous caverns dissolved into it E. All of these are correct. 15. Humans can cause landslides to occur by ________________________. 16. Rocks have weaknesses that set up slope failure where __________________.
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