Plate Tectonics and Earthquakes
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Questions and Answers

What is a key difference between the Richter scale and the Mercalli scale?

  • The Richter scale has a definite end at 12, while the Mercalli scale does not have a set limit. (correct)
  • The Richter scale is subjective, while the Mercalli scale is objective.
  • The Mercalli scale is dependent on human development, while the Richter scale is dependent on seismic wave strength.
  • The Richter scale measures earthquake magnitude, while the Mercalli scale measures earthquake depth.

    • What factor influences the strength of seismic waves in an earthquake?

  • The regularity of the earthquake
  • The predictability of the earthquake
  • The frequency of the earthquake
  • The depth of focus (correct)

    • Which statement accurately describes the occurrence of earthquakes?

  • Earthquakes can be accurately predicted using microquakes as indicators.
  • Hundreds of smaller earthquakes occur every day, while larger ones are less common. (correct)
  • Most earthquakes are large in magnitude and occur infrequently.
  • Earthquakes follow a predictable pattern and occur at regular intervals.

    • What causes shockwaves during seismic events?

    <p>Friction between plates leading to potential energy buildup (A)</p> Signup and view all the answers

    What makes earthquake predictability almost impossible?

    <p>Random nature of earthquake strength (C)</p> Signup and view all the answers

    Which type of boundaries are likely to have stronger seismic waves due to their proximity to the epicenter?

    <p>Conservative boundaries with shallow focuses (B)</p> Signup and view all the answers

    What is responsible for the seismic movement spreading throughout the ground?

    <p>Convection currents in the asthenosphere (C)</p> Signup and view all the answers

    What is the focus of an earthquake?

    <p>The point underground where the earthquake originates from (D)</p> Signup and view all the answers

    Which scale is used to measure seismicity based on the strength of seismic waves?

    <p>Richter Scale (C)</p> Signup and view all the answers

    What is the epicenter of an earthquake?

    <p>The area above ground directly above the focus (C)</p> Signup and view all the answers

    Which belt accounts for 90% of the world's earthquakes?

    <p>Circum-Pacific belt (Ring of Fire) (B)</p> Signup and view all the answers

    How is earthquake predictability often measured?

    <p>By analyzing historical seismic data (C)</p> Signup and view all the answers

    Which index is used to measure the magnitude of volcanic eruptions?

    <p>Volcanic Explosivity Index (VEI) (C)</p> Signup and view all the answers

    What type of volcanic eruptions are characterized by high magnitude and explosiveness?

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

    How are calmer, lower magnitude volcanic eruptions described?

    <p>Effusive (C)</p> Signup and view all the answers

    Which type of volcanoes erupt constantly, contributing to a higher frequency of eruptions?

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

    What does the regularity of volcanic eruptions help in predicting?

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

    Which scale is logarithmic and starts from VEI 2 for measuring volcanic explosivity?

    <p>Volcanic Explosivity Index (VEI) (A)</p> Signup and view all the answers

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