51. What is the primary cause of groundwater depletion in many areas?
52. What does the term �land subsidence� refer to?
53. Which of the following is NOT a typical contaminant found in landfill leachate?
54. What is the main environmental hazard caused by volcanic eruptions?
55. What is a major effect of soil contamination by heavy metals?
56. Which process describes the natural breakdown of rocks by chemical reactions?
57. What is meant by �sustainable development� in environmental geology?
58. Which of the following is used to remediate soil contaminated with petroleum hydrocarbons?
59. What geological factor increases vulnerability to earthquake damage?
60. Which environmental issue is caused by excessive nitrogen and phosphorus in water bodies?
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