Volcanic Eruptions and Activity Classification Quiz
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Questions and Answers

What is the main effect of a thick layer of volcanic ash from a huge volcanic eruption?

  • It can collapse the roofs of buildings due to the weight of the ash. (correct)
  • It can increase the potential for geothermal energy in nearby areas.
  • It can decrease the Earth's average temperature for a few years.
  • It can cause an increase in carbon dioxide in the atmosphere.

What is the main advantage of using geothermal energy?

  • It can be used to produce electricity through geothermal power plants.
  • It is a sustainable energy source that can be replenished within a human lifetime. (correct)
  • It does not contribute to global warming or climate change.
  • It is not susceptible to natural calamities like earthquakes.

What is the relationship between elevation and climate?

  • The higher the elevation, the warmer the climate.
  • The higher the elevation, the colder the climate. (correct)
  • Elevation has no effect on the climate.
  • The higher the elevation, the drier the climate.

What is the main cause of global warming?

<p>Burning of fossil fuels. (D)</p> Signup and view all the answers

Why is Polaris, the North Star, used for navigation?

<p>Polaris is fixed in the northern sky and does not change position. (C)</p> Signup and view all the answers

What is the main effect of the tilt of the Earth's axis?

<p>It causes the change of seasons. (A)</p> Signup and view all the answers

What determines the explosiveness of a volcano's eruption?

<p>Silica content and magma viscosity (A)</p> Signup and view all the answers

How are volcanic belts typically formed?

<p>Along the boundaries of Earth's plates (C)</p> Signup and view all the answers

What triggers the small earthquakes that occur around a volcano before an eruption?

<p>Upward movement of magma (B)</p> Signup and view all the answers

What is a characteristic of Plinian eruptions like that of Mount Pinatubo?

<p>Explosive volcanic eruptions (D)</p> Signup and view all the answers

What geological factor is used to classify volcanoes as active or inactive?

<p>Records of volcanic eruption (B)</p> Signup and view all the answers

What is the molten material inside the Earth ejected during a volcanic eruption called?

<p>Lava (B)</p> Signup and view all the answers

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