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Advanced Volcanology and Physics of Eruptions

Volcanology

Test your knowledge of volcanic processes, magma chemistry, eruptive mechanics, and historical volcanic events.

geology volcanoes earth-science geophysics

7 Questions Hard Ages 13+ Nov 6, 2026

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About this Study Set

This study set covers Volcanology through 7 practice questions. Test your knowledge of volcanic processes, magma chemistry, eruptive mechanics, and historical volcanic events. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 7 questions from the Advanced Volcanology and Physics of Eruptions study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which physical property primarily distinguishes 'A'ā lava flows from Pāhoehoe lava flows of identical basaltic composition?

A Higher flow velocity
B Lower temperature and higher strain rate
C Complete absence of dissolved gases
D Higher sodium and potassium concentration

2 The Volcanic Explosivity Index (VEI) measures eruption magnitude. By what factor does the volume of erupted material increase with each step up on the VEI scale above VEI 1?

A Factor of 2
B Factor of 5
C Factor of 10
D Factor of 100

3 Which structural mechanism differentiates the formation of a volcanic caldera from a standard volcanic crater?

A Explosive blasting away of the mountain summit
B Sub-aerial erosion by rainfall over centuries
C Collapse of the surface structure into an emptied underground magma chamber
D Gradual accumulation of basaltic lava rings

4 Volcanoes emit a variety of volatile gases. Which gas typically accounts for 70% to 90% of total volcanic emissions by volume?

A Carbon dioxide (CO2)
B Sulfur dioxide (SO2)
C Water vapor (H2O)
D Hydrogen sulfide (H2S)

5 What defines a phreatomagmatic volcanic eruption?

A Direct explosive interaction between magma and external ground or surface water
B Eruption driven purely by expanding trapped magmatic gases without water
C Submarine eruption of lava directly onto the abyssal plain
D Slow extrusion of viscous silica-rich lava forming a dome

6 Which volcanic rock texture indicates underwater basaltic extrusion characterized by rapid surface cooling?

A Pillow basalt
B Columnar jointing
C Welded tuff
D Pumice raft

7 What is the primary mechanism that generates electrical charges leading to volcanic lightning in dense ash plumes?

A Radioactive decay of radon gas in the vent
B Triboelectric charging from high-velocity friction between colliding ash particles
C Ionization of volcanic gases by extreme heat
D Interaction between magmatic liquid and atmospheric moisture

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