WorksheetsAQA A Level Volcanic Hazards
Total questions: 10
Worksheet time: 8mins
What percentage of volcanic eruptions occur near plate boundaries?
95%
75%
65%
55%
What are the three types of magma?
Rhyolitic
Andesitic
Basaltic
Ooilitic
Dolomitic
Which of these is not a characteristic of Rhyolitic magma.
It is viscous
Low silica content
Coagulates in the main vent
Explosive, dangerous eruptions
Which of these is NOT a characteristic of Basaltic magma?
Low viscosity
Low silica content (45%-55%)
Effusive Eruptions (non explosive)
High gas content
Which is not true about Tephra?
It travels away from the volcano
In is over 2mm in diameter
It is material ejected from the volcano
Can rise up to 100km
What is created when the column of ejected material collapses?
Nuée ardentes
Pyroclastic Flow
Pyroclasts
Lahars
What hazard is the second most dangerous threat to live from a volcanic eruption?
Lava
Nuée ardentes
Pyroclastic Flows
Lahars
How does a Lahar form?
When people have farmed the volcano slopes and the lava mixes with the soil
When the local geology is unconsolidated material
When rain falls on an extinct volcano and combines with the sediment there
When water from rivers, snow-capped volcanoes or crater lakes mixes with rock fragments and volcanic ash
Mauna Loa, Kilauea and Hualalai have exhibited this type of eruption.
Explosive Eruption
Effusive eruption
Nuée ardentes
Tephra Eruption
As well as erupting rock, tephra and ash, volcanoes eject huge amounts of volcanic gases including hydrochloric acid and sulphur dioxide. Which of these is sulphur dioxide NOT responsible for?
Acid Rain - combining with water to form sulphuric acid
Ozone depletion - sulphuric acid triggers ozone depletion in the stratosphere
Air pollution - breathing problems for those downwind
Increases the intensity of storms - acid in the atomsphere fuels the formation of storms
Reduce solar radiation - sulphuric acid can reflect sunlight
