Spatial Geography of Primary Tectonic Hazards
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Questions and Answers

What is the main driving force of plate movement, according to the text?

  • Ridge push from the formation of new lithosphere at divergent margins
  • Upwelling magma injections at divergent margins
  • Slab pull from the subduction of cold, dense slabs (correct)
  • Convection currents pushing plates apart at divergent margins

    • What is the main reason why the idea of upwelling magma injections as a driving force is disregarded?

  • It does not create new lithosphere at divergent margins
  • It does not contribute to the slab pull process
  • Tomography scans have shown it to be incorrect
  • It does not reduce pressure on the underlying asthenosphere (correct)

    • What is the thickness range of continental plates?

  • 1-8 km
  • 10-25 km
  • 50-75 km (correct)
  • 5-15 km

    • What process extends and thins plates at divergent margins?

    <p>Partial melting due to reduced pressure on the asthenosphere</p> Signup and view all the answers

    What are primary tectonic hazards?

    <p>Earthquakes and volcanoes resulting directly from tectonic activity</p> Signup and view all the answers

    What is the key to understanding the spatial geography of earthquakes and volcanoes?

    <p>Plate tectonic movements</p> Signup and view all the answers

    What happens at passive margins between different types of plates?

    <p>They are not seismically active</p> Signup and view all the answers

    What is the composition of most tectonic plates?

    <p>A mix of oceanic and continental lithosphere</p> Signup and view all the answers

    What is the physical state on which plates move?

    <p>'Slush' layer between upper mantle and lithosphere</p> Signup and view all the answers

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