Seismic Waves

• What do large-scale events like volcanoes produce?

  Seismic waves
• What are the two types of seismic waves discussed?

  P waves and S waves
• How do P waves travel compared to S waves?

  P waves are longitudinal; S waves are transverse
• Can P waves travel through liquids?

  Yes
• Can S waves travel through liquids?

  No
• Which type of seismic wave is faster?

  P waves
• How do scientists study the Earth's internal structure?

  By studying seismic wave travel
• What devices do seismologists use to detect seismic waves?

  Seismometers
• What do seismologists compare to understand wave travel times?

  Their results with other seismologists
• What happens to seismic waves at boundaries between different mediums?

  They can be reflected, absorbed, or transmitted
• What does refraction of waves indicate?

  Waves change speed in different densities
• What occurs at the boundary between the mantle and the outer core?

  A sudden change in density
• How do waves behave as they pass through the liquid outer core?

  They are constantly refracted
• What happens to seismic waves in the mantle?

  They are generally refracted and seem to curve
• How do P waves and S waves differ in their ability to travel through the Earth?

  P waves travel through solids and liquids; S waves only through solids
• Why can't S waves reach the inner core?

  They are surrounded by the liquid outer core
• Where can S waves not be detected during an earthquake?

  In the liquid outer core region
• Why are P waves detected almost everywhere?

  They can travel through solids and liquids
• What is the main takeaway regarding wave detection and Earth's structure?

  Scientists discovered structure by wave detection
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