Volcanic Hazards (AQA A-Level Geography): Flashcards
📚Flashcards
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Practise the cards
10 cards from this deck
Volcanic hazards definition
Volcanic hazards definition
Dangerous effects from volcanic activity
Pyroclastic flow
Pyroclastic flow
Hot gases/ash/material flowing rapidly down volcano
Lahars
Lahars
Mudflows of pyroclastic material mixed with water
VEI (Volcanic Explosivity Index)
VEI (Volcanic Explosivity Index)
Scale 0-8 measuring eruption explosiveness
3 main locations of volcanic activity
3 main locations of volcanic activity
Constructive margins, subduction zones, hot spots
Constructive margin eruption type
Constructive margin eruption type
Frequent but relatively gentle (effusive)
Ring of Fire percentages
Ring of Fire percentages
75% world's volcanoes, 90% earthquakes
Hot spots location
Hot spots location
Away from plate boundaries, fairly stationary
Lava viscosity effect on eruptions
Lava viscosity effect on eruptions
Low = effusive (gentle), high = explosive
VEI logarithmic scale
VEI logarithmic scale
Each step = 10x more tephra ejected