Volcanic Hazards (AQA A-Level Geography): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why are the 300 volcanoes on Russia's Kamchatka peninsula not considered widely hazardous?
Why are the 300 volcanoes on Russia's Kamchatka peninsula not considered widely hazardous?
Very few people live in that remote area
What are pyroclastic flows?
What are pyroclastic flows?
High-density mass of gases & hot ash
At which THREE main locations does volcanic activity occur?
At which THREE main locations does volcanic activity occur?
Constructive margins, subduction zones, hot spots
What percentage of the world's active and dormant volcanoes are in the 'ring of fire'?
What percentage of the world's active and dormant volcanoes are in the 'ring of fire'?
Approximately 75%
How long has the Hawaiian hot spot been active?
How long has the Hawaiian hot spot been active?
Around 70 million years
What happens when lava is highly viscous?
What happens when lava is highly viscous?
Gases cannot move freely, causing explosions
What does the Volcanic Explosivity Index (VEI) measure?
What does the Volcanic Explosivity Index (VEI) measure?
The explosiveness of volcanic eruptions
What are lahars?
What are lahars?
Mudflows of pyroclastic material & water
What type of eruptions occur at constructive plate margins?
What type of eruptions occur at constructive plate margins?
Frequent but relatively gentle eruptions
What is the VEI scale's key characteristic?
What is the VEI scale's key characteristic?
Logarithmic - each step = 10x more material