Spatial Distribution and Volcanic Activity Quiz

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What is used to measure the magnitude of volcanic eruptions?

Mercalli Scale

Richter Scale

Volcanic Explosivity Index (VEI) (correct)

Moment Magnitude Scale

Which type of volcanic eruptions are characterized by being more explosive?

High frequency

Calmer

Intense high magnitude (correct)

Effusive

What determines whether volcanic eruptions are effusive or explosive?

Frequency of eruptions

Type of boundary

Magnitude of the eruption (correct)

Duration of the eruption

How many volcanoes erupt each month on average?

50-60 volcanoes Signup and view all the answers

What does the regularity of volcanic eruptions help in predicting?

Timing of eruptions Signup and view all the answers

Which scale is used for measuring volcanic explosivity where the more powerful the eruption, the more explosive it is?

Volcanic Explosivity Index (VEI) Signup and view all the answers

What is one of the hazards associated with volcanoes mentioned in the text?

Lava flows Signup and view all the answers

What makes lava viscous and slow, leading to explosive eruptions?

Silica content Signup and view all the answers

What is the name given to clouds of burning hot ash and gas that collapse down a volcano at high speeds?

Nuées ardentes/pyroclastic flows Signup and view all the answers

Which type of rock ejected by a volcano is referred to as Tephra?

Any type of rock ejected by a volcano Signup and view all the answers

What causes Glacial floods known as jökulhlaups?

High temperatures melting ice at high latitudes Signup and view all the answers

Which hazardous event is specifically caused by melting ice at high latitudes?

Glacial floods (jökulhlaups) Signup and view all the answers

What method can be used to respond to volcanic hazards directly?

Preventing them directly Signup and view all the answers

What is a primary environmental effect of volcanic hazards?

Wildlife killed Signup and view all the answers

Why is there no definite prediction for a volcanic eruption?

Gases releasing can indicate an imminent eruption Signup and view all the answers

How can the effects of volcanic hazards be reduced?

Mitigating the effects Signup and view all the answers

What can happen if plates become stuck due to friction between them?

Seismic hazards Signup and view all the answers

Which of the following is a secondary economic effect of volcanic hazards?

Conflicts concerning government response, food shortages, insurance etc. Signup and view all the answers