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Volcanoes: Magma Types and Characteristics

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Volcanoes: Magma Types and Characteristics

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Questions and Answers

What is the primary reason for the formation of thick stubby lava flows in andesitic and rhyolitic lava?

High viscosity of the lava (correct)

Low pressure in the volcanic vent

High gas content in the magma

Low viscosity of the lava

What is the characteristic feature of the surface of volcanic domes?

Gently sloping with no spines

Steeply inclined with no surface features

Very rough with numerous spines (correct)

Very smooth with few spines

What happens to the lava at the surface of a volcanic dome?

It piles up over the vent (correct)

It cools and solidifies rapidly

It mixes with water to form a mudflow

It flows away from the vent

What is the primary factor that influences the formation of pyroclastic material?

High gas content in the magma Signup and view all the answers

What is the term for hot, broken fragments of rock that are formed during explosive volcanic eruptions?

Pyroclasts Signup and view all the answers

What is the term for loose assemblages of pyroclasts?

Tephra Signup and view all the answers

What is the term for pyroclasts with an average particle size greater than 64 mm?

Bombs Signup and view all the answers

What happens to blocks of lava on the surface of a volcanic dome?

They break off and roll down the flanks Signup and view all the answers

What is the characteristic shape of lava flows formed by andesitic and rhyolitic lava?

Thick and stubby Signup and view all the answers

What is the primary difference between lava domes and lava flows?

Viscosity of the lava Signup and view all the answers