DRRR final exam

• Where will sinkholes be more likely to form?

  C. waterfalls
• sinkholes

  D. holes that form in the ground when rocks and dirt are washed away under the surface
• What is a limestone?


  A kind of rock
• What do we mean when we say that rock erodes?


  B. It is picked up and moved to another place.
• What does a rainfall-induced landslide mean?


  D. soil, rock, debris sliding down the slope
• What refers to a natural depression or hole caused by some form of collapse of the surface layer of the ground?

  A sinkhole
• Which of the following is NOT a type of a sinkhole?

  A solution sinkholes
• Which of the following refers to natural earth processes that could cause mortality, damage to property and livelihood?

  D. geological hazard
• Which is not a cause of landslide?

  D. cover collapse landslide
• Which is not an impending sign for rainfall-induced landslide?

  B. new cracks at the foundations of buildings and houses
• What is the usual cause of natural sinkholes?

  D. physical and chemical erosion
• What is a cause of landslide that pertains to cutting of trees to make way for agriculture and construction?

  D. human activity
• What type of sinkholes occurs when the bedrock is covered by soil and materials that are not well-knitted together and is usually made from mostly clay or sand?

  D. cover subsidence sinkhole
• Which is not an impending sign of a sinkhole?

  C. rapid rise in water levels of the creek
• What type of sinkhole that occurs when the bedrock is covered by a deep layer of soil and earth then the bedrock erodes resulting into a hole?

  C. cover collapse sinkholes
• After the 7.2 magnitude earthquake in Bohol last 2013, almost 100 sinkholes were said to be found all over the city of Tagbilaran. How were these sinkholes formed?

  D. The holes formed in the ground when rocks and dirt moved away under the surface.
• What is the primary cause of sinkholes?

  A water
• The side of the mountain is slowly exposing a big rock underneath it. The local government unit told the residents nearby that it is eroding and will expect that it may cause a landslide during a torrential rain. What do they mean when the LGU said it is "eroding"?

  D. The soil is picked up and moved to another place.
• Bohol island is covered with limestones, this is usually the cause of sinkholes in the island. What best describes a limestone?

  A A kind of rock that can cause sinkholes.
• Which of the following is an impending sign for rainfall-induced landslide?

  D. Unusual noises, such as breaking trees, or knocking boulders together.
• In other countries, some of the large sinkholes that form on their lands are used as dumpsites. If the Philippines would adopt this kind of activity, what do you think will happen?

  A The country's problem with trash will have a solution.

  B. Water resources near the sinkholes could be contaminated.

  C. The sinkhole may further collapse if tons and tons of trash will be thrown in the hole.
• Which of the following does NOT cause a landslide?

  A Rocks flowing down the stream
• The Juan corporation bought a piece of land to build their new project. Together with the local government unit they identified possible sinkholes that may appear on the land. They observed that there is only a thin layer of soil covering the bedrock underneath the land and the bedrock is starting to erode and to have a depression. What type of sinkhole did the land surveyors identified?

  Solution Sinkholes
• Which of the following is a geological hazard?

  Sinkholes

  earthquake

  landslides
• The Juan corporation wants to create a subdivision overlooking the sea. They acquired a good sum of land on a mountain slope near the bay but before they can proceed with construction, they need to cut down all the trees in the area. What do you think will happen if torrential rain pours after all the trees were cut down?

  D. Removing the trees and vegetation may increase the risk of a landslide.
• What will happen if the sides of a hill regularly experience a rainfall-induced landslide?

  A The bottom of the hill will be covered with mud and other debris present in the slope.

  B. The slopes of the hill will be mostly run down due to the regular occurrence of landslides.

  C. During torrential rains, the water will just continue to flow down the bottom of the hill and flood the area.
• Natural sinkholes are usually caused by physical and chemical erosion. A sinkhole may appear overtime but sometimes may suddenly form after a large earthquake. How can you tell if there is a possibility of a sinkhole forming in your home?

  A There are cracks on the foundation of the house.

  B. There are cracks on the soil surrounding the house.

  C. There are craters and depressions forming in the ground
• Mark observed that the soil at their backyard was made of a mixture of clay and sand, and somewhat a bit loose. A shallow depression can be seen forming. He called the attention of their barangay and they said that a sinkhole is forming. What kind of sinkhole is being formed?

  cover subsidence sinkhole
• What type of sinkhole occurs when the bedrock is covered by a deep layer of soil and earth then the bedrock erodes resulting into a hole?

  cover collapse sinkholes
• During the La Niña in the Philippines, torrential rain usually occurs from time to time and pours over a large area of the land. Overtime on the slopes of the mountains, rainfall-induced landslides happen. Why do such events occur?


  -Because the area is a slope, it is natural that the excessive water will run down the hill and bring with it soil, rocks, and other debris.

  -The possibility of having no trees to absorb water or to hold the soil and debris on the slope of the mountain

  -The soil in the area may already be saturated with water