13. Which of the following statement/s is true about how does a forest fire cause a lands 1. it makes the soil water-resistant II. it burns resin, oil, fat stored in vegetation III. it strengthens the adhesiveness of the soil IV. it increases runoff A. I, II, IV only B. I, II, Ill only C. both I and II only D. both Ill and IV only 14. Which of the following is/are true about how a volcanic eruption trigger a landslide? 1. it attracts rain clouds Il by altering minerals to clay III. volcanic gas dissolved in groundwater weakens rock IV. vibrations loosen the soil surrounding the volcano A. I, II, IV only B. II and III only II, III, IV only D. I, II, III, and IV 15. Which of the following is true about the relationship of gravity to landslides? 1. steeper slope can trigger massive landslide II. steep slope means faster landslide III. steep slope means nearer landslide debris IV. steeper slope can cause more viscous landslide a. I only b. ll only c. Ill only d. IV only 16. Ground water pumping is an artificial cause of sinkholes, how does it contribute to the formation of a sinkhole? a. It transfers the water upward. b. It dissolves acidic water to the soil. It creates new water diversion systems. d. It carries the water further downstream. 17. Which of the following is not an effect of frequent submersion of soil in water? a. curving b. weakened soil c. formation of spaces d. shriveled soil particles 18. Which of the following statement's is true about how does a forest fire cause a landslide? I. it makes the soil water-resistant II. it burns resin, oil, fat stored in vegetation III. it strengthens the adhesiveness of the soil IV. it increases runoff a. I, II, IV only b. I, II, III only c. both I and II only d. both III and IV only 19. Which of the following is/are true about how a volcanic eruption trigger a landslide? I. it attracts rain clouds II. by altering minerals to clay III. volcanic gas dissolved in groundwater weakens rock