10 Questions
What is the primary reason for the formation of thick stubby lava flows in andesitic and rhyolitic lava?
High viscosity of the lava
What is the characteristic feature of the surface of volcanic domes?
Very rough with numerous spines
What happens to the lava at the surface of a volcanic dome?
It piles up over the vent
What is the primary factor that influences the formation of pyroclastic material?
High gas content in the magma
What is the term for hot, broken fragments of rock that are formed during explosive volcanic eruptions?
Pyroclasts
What is the term for loose assemblages of pyroclasts?
Tephra
What is the term for pyroclasts with an average particle size greater than 64 mm?
Bombs
What happens to blocks of lava on the surface of a volcanic dome?
They break off and roll down the flanks
What is the characteristic shape of lava flows formed by andesitic and rhyolitic lava?
Thick and stubby
What is the primary difference between lava domes and lava flows?
Viscosity of the lava
Learn about the different types of magma, including mafic, intermediate, and felsic, and their characteristics. Understand the composition of magma and how it affects volcanic eruptions.
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