Types of Landslides

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Questions and Answers

What is the primary cause of Debris Flow Landslides?

Soil erosion

Heavy rain

Saturated slope (correct)

Earthquakes

What is the characteristic of Slumping Landslides?

Landslides of water-soaked mass of rock and soil

Downward movement of rock debris as a unit (correct)

Slow downslope movement of particles

Sudden movement of rock debris

What is the depth range of sinkholes?

From a couple of meters to several miles deep (correct)

A few meters deep

Hundreds of feet deep

Only a few inches deep

What is the primary cause of Rock Fall Landslides?

Heavy rain Signup and view all the answers

What is Soil Creep Landslide?

A very slow downslope movement of particles Signup and view all the answers

What is a characteristic of areas prone to sinkholes?

Soft mineral foundation Signup and view all the answers

What is the primary cause of landslides and sinkholes in the Philippines?

Typhoons with heavy rain Signup and view all the answers

What is the type of landslide that is also known as a mudslide or debris avalanche?

Landslide Signup and view all the answers

What is the primary difference between landslides and sinkholes?

Type of terrain Signup and view all the answers

What is an example of a geological hazard that is not necessarily related to natural conditions?

Human-induced sinkholes Signup and view all the answers

What is the term for the slow movement of soil or rock debris down a slope?

Soil Creep Landslide Signup and view all the answers

What type of landslide involves a mix of water and sediment flowing down a slope?

Debris Flow Landslide Signup and view all the answers

What occurs as water passes through cracks and fissures in the soil?

The soil erodes and forms a conduit system Signup and view all the answers

What forms if a void filled with air becomes clogged with clay?

A depression that accumulates water and forms a pond Signup and view all the answers

What is a characteristic of a Cover Collapse Sinkhole?

It develops suddenly, causing catastrophic damage Signup and view all the answers

What type of sinkhole occurs in areas where limestone or dolomite is exposed on the ground?

Dissolution Sinkhole Signup and view all the answers

What is an example of human activity that can cause an Artificial Sinkhole?

All of the above Signup and view all the answers

What is the term for the process of soil erosion through internal erosion?

Internal erosion Signup and view all the answers

Study Notes

Types of Landslides

Soil Creep Landslide: Characterized by slow downslope movement of particles in loose, weathered material; occurs on every slope.
Slumping Landslide: Downward movement of rock debris as a unit along a curved failure plane; results in a scarp at the top.
Debris Flow Landslide: Triggered by water saturation; a mass of water-soaked rock and soil slides down the slope.
Rock Fall Landslide: Sudden slides caused by heavy rain, where loosened rocks on slopes fall rapidly.

Sinkholes

Definition: Topographic depressions created when groundwater dissolves limestone bedrock; also known as "sink" or "doline."
Characteristics: Usually occur in areas with soft minerals like limestone or salt, with depths ranging from meters to miles.
Formation Process:
- Rainwater seeps through cracks in the soil into the underlying rock.
- Erosion of soil forms channels, increasing the size of underground water systems.
- Can create voids filled with air or water, leading to possible collapses.

Geological Hazards

Definition: Natural phenomena causing significant issues globally, often exacerbated by urban expansion and development.
Types: Landslides (also known as mudslides or debris avalanches) and sinkholes differentiate based on composition and terrain.
Landslide vs. Sinkhole: Landslides involve soil collapsing downward on an incline, while sinkholes can appear on any surface, from flat to elevated.

Types of Sinkholes

Cover Collapse Sinkhole: Develops suddenly, causing significant damage; may form within an hour.
Cover Subsidence Sinkhole: Grows gradually in areas where sediment is permeable, typically containing sand.
Dissolution Sinkhole: Occurs in calcareous areas with thin soil cover; intensified by water's contact with rock surfaces.
Artificial Sinkhole: Generated by human activities such as groundwater pumping or construction.

Contextual Considerations

Philippines Geography: Characterized by mountainous terrain and frequent typhoons, increasing the risk of landslides and sinkholes due to heavy rainfall.
Geologic Hazards: These hazards are closely linked to both natural conditions and human actions, impacting safety and infrastructure.

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Description

Test your knowledge of different types of landslides, including soil creep, slumping, and debris flow landslides. Learn about their characteristics and how they occur. Improve your understanding of geology and natural disasters.