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?

<p>High gas content in the magma (A)</p>
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What is the term for hot, broken fragments of rock that are formed during explosive volcanic eruptions?

<p>Pyroclasts (A)</p>
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What is the term for loose assemblages of pyroclasts?

<p>Tephra (D)</p>
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What is the term for pyroclasts with an average particle size greater than 64 mm?

<p>Bombs (D)</p>
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What happens to blocks of lava on the surface of a volcanic dome?

<p>They break off and roll down the flanks (D)</p>
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What is the characteristic shape of lava flows formed by andesitic and rhyolitic lava?

<p>Thick and stubby (C)</p>
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What is the primary difference between lava domes and lava flows?

<p>Viscosity of the lava (B)</p>
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