A) Particle agglomeration B) Prevailing winds C) Air humidity D) The initial momentum from the eruption
A) When the eruption stops B) When the ash particles are fully dispersed C) When the bulk density of the column is the same as the surrounding atmosphere D) When the column reaches the stratosphere
A) Eruption column height B) Prevailing winds C) Ash particle size D) Particle density
A) Accretionary lapilli B) Co-ignimbrite plumes C) Eruption columns D) Magmatic eruption plumes
A) Particle agglomeration B) Air humidity C) Elutriation of smaller particles D) Wind direction
A) Usually short-term and mild B) Long-term and chronic C) No effect D) Immediate and severe
A) Bronchitis B) Pneumonia C) Silicosis D) Asthma
A) Desert areas B) Mountainous regions C) Rural areas D) Urban areas with high population densities
A) Earthquakes B) Heavy rainfall C) High wind speeds D) A few millimetres or centimetres of volcanic ash
A) Only grain size and chemistry B) Only preparedness measures C) Ash fall thickness, grain size, chemistry, moisture, duration, and mitigation measures D) Only ash fall thickness
A) Multiple knock-on effects disrupting various sectors and services B) No impact on infrastructure C) Only minor disruptions D) Immediate recovery of services
A) Magmatic eruption plumes contain more coarse particles B) Co-ignimbrite plumes are less dense C) Magmatic eruption plumes are formed by pyroclastic density currents D) Co-ignimbrite plumes have higher concentrations of fine ash particles
A) Seconds to minutes B) Months to years C) Days to weeks D) Minutes to hours
A) The aviation industry B) Aquatic plants C) Terrestrial animals D) Marine life
A) Local weather patterns B) Global climate C) Soil fertility D) Ocean currents
A) Gas particles B) Coarse particles C) Accretionary lapilli D) Fine particles
A) The result of particle agglomeration within the column B) A type of lava flow C) A type of volcanic gas D) A type of volcanic rock
A) It disappears completely B) It becomes less concentrated C) It remains constant D) It becomes more concentrated
A) It decreases exponentially B) It remains constant C) It fluctuates randomly D) It increases exponentially
A) Reduced need for evacuation plans B) Improved infrastructure resilience C) Decreased risk of volcanic eruptions D) Increased human exposure to volcanic ash fall events
A) Business disruption and insured losses B) Higher agricultural yields C) Increased tourism D) Reduced transportation costs
A) Preparedness, management, and prevention measures B) Reducing wind speed C) Ignoring the ash fall D) Increasing population density
A) Enhancement B) Disruption C) Improvement D) No impact
A) ~3 B) ~7 C) ~5 D) ~2
A) 1 mm B) 2 mm C) 5 mm D) 10 mm
A) Rhyolitic B) Basaltic C) Dacitic D) Andesitic
A) Effusive eruptions B) Silicic explosive eruptions C) Basaltic eruptions D) Phreatic eruptions
A) Fusion B) Crystallization C) Solidification D) Communition
A) At the summit crater B) Well below the summit crater C) At the surface D) Above the summit crater
A) 10 μm B) 1 μm C) 5 μm D) 2 mm
A) Greater than 69% B) Between 55 and 69% C) Less than 45% D) Approximately 45–55%
A) Sulfate salts B) Chloride salts C) Carbonate salts D) Fluoride salts
A) Pumice B) Tephra C) Volcanic ash D) Magma
A) Leidenfrost effect B) Boiling effect C) Condensation effect D) Sublimation effect
A) Agriculture B) Fishing C) Mining D) Tourism
A) Strombolian basaltic eruptions B) Phreatic eruptions C) Hawaiian lava fountains D) Rhyolite eruptions
A) They play only a minor role B) They have no role C) They are the primary determinants D) They are the sole determinants
A) National Institutes of Health B) Centers for Disease Control and Prevention C) World Health Organization D) International Agency for Research on Cancer
A) 25 μg/m3 B) 100 μg/m3 C) 75 μg/m3 D) 50 μg/m3
A) No B) Yes, many cases C) Yes, but only a few cases D) Yes, in occupational settings only
A) Long-term studies B) Short-term studies C) Animal studies D) Laboratory studies
A) Increased wool production B) Natural abortions C) Resistance to ash ingestion D) Improved grazing habits
A) Increased resistance to disease B) Gastrointestinal blockages C) Enhanced wool quality D) Improved digestion
A) Improving the insulator's conductivity. B) Increasing the voltage across the insulator. C) Reducing the insulator's surface area. D) Initiating a leakage current that can cause a flashover.
A) Roof-fed systems B) Surface water-fed systems C) Rainwater-fed systems D) Groundwater-fed systems
A) Electricity outages B) Increased water demand C) Chemical contamination D) Microbial contamination
A) pH adjustment B) Filtration C) Sedimentation D) Chlorination
A) Tanks should be emptied B) Downpipes should be disconnected C) Tanks should be filled to capacity D) Tanks should be painted
A) Through inflow/infiltration by stormwater B) Through evaporation C) Through direct filtration D) Through chemical treatment
A) There was no damage reported. B) Total damage was US$80 million. C) Total damage was US$50 million. D) Total damage was US$100 million.
A) Dr Jane Smith B) Dr Fred Prata C) Dr John Doe D) Dr Emily White
A) 60 km B) 80 km C) 100 km D) 30 km
A) 5,000 ft B) 15,000 ft C) 10,000 ft D) 20,000 ft
A) 2–5 minutes B) 7–10 minutes C) 20–30 minutes D) 15–20 minutes
A) Eleven B) Nine C) Seven D) Five
A) Reduces visibility B) Enhances communication systems C) Improves runway traction D) Increases visibility
A) Removal before resuming full operations B) Ignored as it disappears like snow C) Left to settle naturally D) Covered with sand
A) Improved traction B) Reduction in visibility C) Enhanced signal reception D) Increased speed
A) Radar B) Anemometers C) Barometers D) Thermometers
A) 1991 B) 1979 C) 1980 D) 1992
A) Rain B) Snow C) Wind D) Lightning
A) Laptop computers. B) Servers. C) Tablets. D) Desktop computers.
A) Sunlight. B) Rain. C) Heat. D) Wind.
A) Roofs with solar panels. B) Flat roofs. C) Roofs with gutters. D) Steeply pitched roofs.
A) Only property damage occurred. B) About 300 people were killed. C) The eruption was halted. D) There was no significant damage.
A) Dust masks. B) Surgical masks. C) Cloth masks. D) Bandanas.
A) Wear goggles. B) Wear sunglasses. C) Apply eye drops. D) Use contact lenses.
A) Oil the engines thoroughly. B) Remove the engines. C) Run the engines continuously. D) Cover the engines.
A) Recreational parks. B) Commercial zones. C) Critical facilities. D) Residential areas.
A) Soil enricher. B) Pest repellent. C) Fertilizer. D) Compost.
A) Andisol. B) Clay. C) Loam. D) Silt.
A) Andisol layer. B) Subsoil layer. C) Topsoil layer. D) Humus layer.
A) Install air filters. B) Evacuate livestock. C) Keep livestock indoors. D) Provide extra feed.
A) Place in a refrigerator. B) Use plastic sheeting. C) Submerge in water. D) Wrap in cloth. |