Direction: Evaluate the truthfulness of each statement. Write T if the statement is true and F if it is false. 1. A landslide is the very slow to rapid upward movement of a big bulk of soil, debris, rock, and garbage up a slope.
2. A landslide happens if the driving force is equal to the resisting force.
3. Landslides are openings or pits in the ground surface caused by the collapse in the ceiling of an underground cavity or space.
4. A sinkhole is formed due to the absence of external surface drainage when water gathers inside; the water would just drain into the subsurface.
5. Sinkholes naturally occur in areas underlain by minerals and rocks that are soluble or can be dissolved by water.
6. The Varnes’ system is a landslide classification that utilizes two terms: the first term describes the material type and the second term describes the type of movement.
7. Creep is an imperceptibly slow, steady, downward movement of slope forming soil or rock.
8. Dissolution sinkhole is the type of sinkhole that occurs in areas where there is little soil or vegetation over the soluble rock.
1
9. An earthflow has a characteristic “hourglass” shape.
10. Hazard mapping can be done to minimize landslide risks. 11. All sinkholes happen in an instant.
12. Cover-subsidence sinkhole tend to develop abruptly and cause catastrophic damages.
13. A flow starts with the detachment of soil or rock from a steep slope along a surface on which little or no shear displacement takes place.
14. Landslides can be triggered by extreme rainfall, earthquakes, and human activities.
15. Landslides and sinkholes happen without notice and cannot be