Podcast
Questions and Answers
Which of the following statements is true about inactive volcanoes?
Which of the following statements is true about inactive volcanoes?
- Volcanoes that might erupt anytime
- Volcanoes that have record of eruption within the last 600 years
- Volcanoes that have no records of eruption for the last 10,000 years (correct)
- None of the above
What type of volcano possesses a steep slope and wide crater?
What type of volcano possesses a steep slope and wide crater?
- stratovolcano (correct)
- cinder cone volcano
- shield volcano
- composite volcano
What will happen to the viscosity of magma when the temperature increases?
What will happen to the viscosity of magma when the temperature increases?
- also increases
- will remain the same
- they are not related
- decreases (correct)
What do you call the type of volcano that is shown below?
What do you call the type of volcano that is shown below?
Which of the following volcanic eruptions that occurs due to contact between water and magma?
Which of the following volcanic eruptions that occurs due to contact between water and magma?
What type of volcanic eruption is driven by explosive expanding steam resulting from surface water coming into contact with magma?
What type of volcanic eruption is driven by explosive expanding steam resulting from surface water coming into contact with magma?
What type of volcanic eruption that is characterized by fountain of viscous lava?
What type of volcanic eruption that is characterized by fountain of viscous lava?
Pelean eruption is said to be the most violent of all types of volcanic eruptions.
Pelean eruption is said to be the most violent of all types of volcanic eruptions.
Quiet eruption is caused by highly viscous magma inside the vent that easily solidifies, and forms a blockage in the crater of the volcano.
Quiet eruption is caused by highly viscous magma inside the vent that easily solidifies, and forms a blockage in the crater of the volcano.
PHIVOLCS have listed five types of volcanic eruptions.
PHIVOLCS have listed five types of volcanic eruptions.
Match the description in column A with the type of volcanic eruption in column B.
Match the description in column A with the type of volcanic eruption in column B.
What do you call the eruption which is characterized by lava fountains and outbursts of molten lava?
What do you call the eruption which is characterized by lava fountains and outbursts of molten lava?
What do you call the eruption that occurs when the dome or of the tall eruption column collapses and produces a glowing avalanche?
What do you call the eruption that occurs when the dome or of the tall eruption column collapses and produces a glowing avalanche?
What do you call the eruption that results from an ejection of magmatic gases and steam produced by the conversion of groundwater to steam by ascending magma?
What do you call the eruption that results from an ejection of magmatic gases and steam produced by the conversion of groundwater to steam by ascending magma?
What do you call the eruption that is said to be the most violent of all types of volcanic eruptions?
What do you call the eruption that is said to be the most violent of all types of volcanic eruptions?
What do you call the eruption that may result in the formation of caldera or volcano-tectonic depressions?
What do you call the eruption that may result in the formation of caldera or volcano-tectonic depressions?
What do you call the eruption resulting from the release of large quantities of accumulated magmatic gas, which lifts fine ash with great force high into the air, forming voluminous cauliflower clouds?
What do you call the eruption resulting from the release of large quantities of accumulated magmatic gas, which lifts fine ash with great force high into the air, forming voluminous cauliflower clouds?
Which of the following statements is not one of the roles of PHIVOLCS in disaster risk management?
Which of the following statements is not one of the roles of PHIVOLCS in disaster risk management?
Briefly explain what happens when volcanoes erupt.
Briefly explain what happens when volcanoes erupt.
What did you experience/ other experience during Mayon Volcano eruption? What measures are done by the LGU to secure the safety and health of the people?
What did you experience/ other experience during Mayon Volcano eruption? What measures are done by the LGU to secure the safety and health of the people?
Flashcards
What is a phreatic eruption?
What is a phreatic eruption?
A type of volcanic eruption driven by steam produced when groundwater is heated due to underlying heat sources.
What is a phreatomagmatic eruption?
What is a phreatomagmatic eruption?
An eruption resulting from the ejection of magmatic gases and steam produced by the conversion of groundwater to steam by ascending magma.
What is a vulcanian eruption?
What is a vulcanian eruption?
An eruption resulting from the release of large quantities of accumulated magmatic gas, lifting fine ash with great force, forming voluminous cauliflower clouds.
What is a strombolian eruption?
What is a strombolian eruption?
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What is a pelean eruption?
What is a pelean eruption?
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What is a plinian eruption?
What is a plinian eruption?
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What is pyroclastic flow?
What is pyroclastic flow?
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What is lava flow?
What is lava flow?
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What is ashfall or tephra fall?
What is ashfall or tephra fall?
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What is lahar?
What is lahar?
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What are volcanic gases?
What are volcanic gases?
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What is a debris avalanche or volcanic landslide?
What is a debris avalanche or volcanic landslide?
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What are tsunamis related to volcanic eruptions?
What are tsunamis related to volcanic eruptions?
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What are secondary explosions?
What are secondary explosions?
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What are the roles of PHIVOLCS in Disaster Risk Management?
What are the roles of PHIVOLCS in Disaster Risk Management?
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What are the effects of volcanic eruptions and their risks to communities?
What are the effects of volcanic eruptions and their risks to communities?
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What causes explosive volcanic eruptions?
What causes explosive volcanic eruptions?
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What causes quiet volcanic eruptions?
What causes quiet volcanic eruptions?
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What is a composite volcano?
What is a composite volcano?
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What is a shield volcano?
What is a shield volcano?
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What is a cinder cone volcano?
What is a cinder cone volcano?
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What happens to the viscosity of magma when the temperature increases?
What happens to the viscosity of magma when the temperature increases?
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Which type of volcanic eruption is considered the most violent?
Which type of volcanic eruption is considered the most violent?
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What is the main characteristic of the type of volcanic eruption that forms voluminous cauliflower clouds?
What is the main characteristic of the type of volcanic eruption that forms voluminous cauliflower clouds?
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How are volcanoes that might erupt anytime classified?
How are volcanoes that might erupt anytime classified?
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Study Notes
Introduction
- Volcanoes can cause disasters, even to distant communities
- Mount Pinatubo's eruption (1991) after 600 years of inactivity caused widespread destruction, affecting over 100,000 homes and covering vast areas in sediment.
Types of Volcanoes and Volcanic Eruptions
- A quiz to assess prior knowledge about volcanoes is provided (questions and possible answers are also included.)
- Types of volcanoes are described, including shield, cinder cone, composite, and descriptions of their features (steep sides, wide crater).
- Magma viscosity is discussed and its relationship to temperature – an increase in temperature decreases viscosity.
Explosive and Quiet Eruptions
- Explosive eruptions are caused by highly viscous magma that eventually solidifies, blocking gas release and increasing pressure. This leads to a violent eruption. Most Philippine volcanoes erupt explosively.
- Quiet eruptions involve fluid magma, letting expanding gases escape easily, resulting in a less explosive, but spectacular release of material. Quiet eruptions are also linked to ridge systems.
Types of Volcanic Eruptions
- Six types of volcanic eruptions are listed by PHIVOLCS, including Phreatic, Phreatomagmatic, Vulcanian, Strombolian, Pelean, and Plinian
- Each eruption type is described, and the characteristics associated with them. Examples are given, like Mayon Volcano (2006 for phreatic), Kavachi Volcano (2000 for phreatomagmatic), Mount Etna (2002 for strombolian), and Mount Vesuvius (1779 for Plinian).
Effects of Volcanic Eruptions
- Volcanic materials and hazards include:
- Pyroclastic flows (fast-moving hot rock and gas, very destructive)
- Lava flows (molten rock flows)
- Ashfall or tephra fall (fine to coarse materials, can cause respiratory problems, and structural damage)
- Lahars (volcanic mudflows)
- Volcanic gases (harmful).
- Other hazards: debris avalanches, tsunamis, and secondary explosions can potentially result as well.
The Role of PHIVOLCS
- PHIVOLCS predicts volcanic eruptions and earthquakes.
- They determine how these events occur.
- They identify potentially affected regions.
- They provide forecasting data.
- Develop disaster preparedness and response strategies.
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Description
Test your knowledge on volcanoes with this quiz that covers various types and characteristics of volcanic eruptions. Learn about the differences between explosive and quiet eruptions, as well as the impact of magma viscosity on eruption intensity. Perfect for students interested in geology and earth sciences.
