Podcast
Questions and Answers
Which human activity contributes most significantly to the formation of sinkholes?
Which human activity contributes most significantly to the formation of sinkholes?
- Implementing widespread reforestation programs.
- Increased construction of retaining walls.
- Excessive extraction of groundwater. (correct)
- Deforestation on steep slopes.
Why does rain with a slightly acidic pH (around 6) contribute to sinkhole formation?
Why does rain with a slightly acidic pH (around 6) contribute to sinkhole formation?
- It neutralizes alkaline compounds in the soil, weakening its structure.
- It increases the rate of vegetation growth, leading to root decay and soil instability.
- It rapidly saturates the soil, leading to ground swelling.
- It dissolves limestone and other soluble rocks underground. (correct)
Which of the following factors is LEAST likely to contribute to rain-induced landslides?
Which of the following factors is LEAST likely to contribute to rain-induced landslides?
- Dense vegetation cover on a slope. (correct)
- High rainfall intensity over a short period.
- Soil saturation from prolonged rainfall.
- A steep slope with unstable soil composition.
Which mitigation strategy would be most effective in preventing landslides on a slope with high soil saturation?
Which mitigation strategy would be most effective in preventing landslides on a slope with high soil saturation?
What distinguishes a mudslide from a typical landslide?
What distinguishes a mudslide from a typical landslide?
PAGASA's primary role relates to what?
PAGASA's primary role relates to what?
PHIVOLCS is the primary agency for what?
PHIVOLCS is the primary agency for what?
Which scale would be most appropriate to use to assess the damage and impact of an earthquake on infrastructure and human populations?
Which scale would be most appropriate to use to assess the damage and impact of an earthquake on infrastructure and human populations?
The Richter scale is used to measure an earthquake's:
The Richter scale is used to measure an earthquake's:
Charles F. Richter and Beno Gutenberg are best known for their work related to:
Charles F. Richter and Beno Gutenberg are best known for their work related to:
Flashcards
Causes of Sinkholes
Causes of Sinkholes
Sinkholes can be caused by the depletion of the water table, or by rain intrusion (6ph - slightly acidic).
Rain-Induced Landslides
Rain-Induced Landslides
Mass wasting due to factors like soil saturation, slope steepness, soil composition, vegetation cover and rainfall instensity.
Landslide
Landslide
Involves disturbances in a slope's natural stability.
Mudslide
Mudslide
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Mitigating Rain-Induced Landslides
Mitigating Rain-Induced Landslides
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PAG-ASA
PAG-ASA
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PHIVOLCS
PHIVOLCS
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Richter Scale
Richter Scale
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Mercalli Scale
Mercalli Scale
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Study Notes
- Sinkholes are caused by the depletion of the water table.
- Sinkholes can also be caused by rain intrusion, where the rain is slightly acidic with a pH of 6.
Rain-Induced Landslides
- Rain-induced landslides are a form of mass wasting.
- Soil saturation is a factor in rain-induced landslides.
- Slope steepness is a factor in rain-induced landslides.
- Soil composition is a factor in rain-induced landslides.
- Vegetation cover is a factor in rain-induced landslides.
- Rainfall intensity is a factor in rain-induced landslides.
Mitigating Rain-Induced Landslides
- Hazard mapping is a method of mitigating landslides.
- Warning signs are a method of mitigating landslides.
- Building structures is a method of mitigating landslides, such as:
- Benching / Terracing
- Retaining Wall
- Drainage
- Reforestation is a method of mitigating landslides.
Landslide vs. Mudslide
- Landslides are caused by disturbances in the natural stability of a slope.
- Mudslides occur when water rapidly accumulates in the ground.
- Mudslides result in a surge of water-saturated rock, earth, and debris.
Acronyms
- PAG-ASA is the Philippine Atmospheric, Geophysical, and Astronomical Services Administration.
- PHIVOLCS is the Philippine Institute of Volcanology and Seismology.
Scales
- The Richter Scale was created by seismologists Charles F. Richter and Beno Gutenberg.
- The Mercalli Scale was created by volcanologist Giuseppe Mercalli.
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