Lesson 3.5.2
3.5.2 What are the main hazards generated by volcanic activity? Quiz: OCR Geography, Unit 9
20 questions
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Lesson 3.5.2, What are the main hazards generated by volcanic activity?: 20 multiple choice questions for the OCR Geography (H481), Unit 9: Hazardous Earth, written with Revision Ninja.
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The 20 questions
-
What type of eruption is characterised by low-viscosity basaltic magma?
- Explosive eruption
- Effusive eruption
- Phreatic eruption
- Plinian eruption
-
At which plate boundary type do explosive volcanic eruptions typically occur?
- Convergent boundaries
- Transform boundaries
- Conservative boundaries
- Divergent boundaries
-
Which volcanic landform is created by intraplate hot spot activity?
- Hawaiian island chain
- East African Rift
- Peru-Chile Trench
- Mid-Atlantic Ridge
-
Which scale is used to measure the relative explosiveness of volcanic eruptions?
- Volcanic Explosivity Index
- Richter Scale
- Modified Mercalli Scale
- Moment Magnitude Scale
-
Which primary volcanic hazard consists of high-speed flows of hot gas and ash?
- Lava flow
- Tephra fall
- Lahar
- Pyroclastic flow
-
Which secondary hazard occurs when volcanic eruptions rapidly melt ice caps?
- Jokulhlaup
- Liquefaction
- Tsunami
- Pyroclastic flow
-
Which volcanic hazard involves mudflows of ash mixed with meltwater or rainfall?
- Earthflow
- Avalanche
- Lahar
- Rockfall
-
Which dense gas released during volcanic eruptions can cause localized asphyxiation?
- Sulphur dioxide
- Carbon dioxide
- Water vapour
- Helium
-
A volcano erupts low-silica magma at a mid-ocean ridge. Which hazard dominates?
- Ignimbrite flow
- Lava flow
- Tephra fall
- Pyroclastic flow
-
An explosive volcano produces an ash plume reaching high into the atmosphere. What is this airborne material?
- Lahar
- Tephra
- Pahoehoe
- Basalt
-
A violent volcanic eruption causes a sea-bed displacement. Which secondary hazard is triggered?
- Ground displacement
- Jokulhlaup
- Liquefaction
- Tsunami
-
Which magma property directly causes explosive eruptions by trapping expanding dissolved gases?
- High viscosity
- High density
- Low temperature
- Low viscosity
-
A continental rift valley volcano forms from crustal stretching. Which rift is a prime example?
- Baikal Rift Zone
- Alpine Fault Zone
- East African Rift
- San Andreas Fault
-
An eruption ejects over one thousand cubic kilometres of material. What type of volcano is this?
- Shield volcano
- Super-volcano
- Composite volcano
- Cinder cone
-
A volcano erupting under a glacier causes sudden downstream flooding. What process causes this?
- Ground liquefaction
- Ice melting
- Sea-bed uplift
- Landslide damming
-
How does the Volcanic Explosivity Index scale increase with each numerical step upward?
- Logarithmically by 2
- Logarithmically by 10
- Linearly by 100
- Linearly by 10
-
Why do effusive volcanic eruptions rarely produce dangerous pyroclastic flows?
- Low magma viscosity
- High silica content
- Rapid crust cooling
- Extreme water content
-
What magma composition is typically associated with broad shield volcanoes like Mauna Loa?
- Rhyolitic magma
- Andesitic magma
- Basaltic magma
- Granitic magma
-
Which combination of magma characteristics produces the most hazardous explosive eruptions?
- Low silica gas-poor
- High silica gas-rich
- Low silica gas-rich
- High silica gas-poor
-
What feature forms when a super-volcano magma chamber empties and collapses inward?
- Fault escarpment
- Stratovolcano cone
- Massive caldera
- Ocean trench
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