IRIS How do P S waves give evidence for a liquid outer core

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Resource Type:Teaching Media; Videos or Animations
Grade Level:
9 10 11 12
Organization:Incorporated Research Institutions for Seismology (IRIS)
Publication Date:2015
Summary:The seismic shadows are the effect of seismic waves striking the core-mantle boundary. P and S waves radiate spherically away from an earthquake's focus in all directions and return to the surface by many paths. S waves, however, don't reappear beyond an angular distance of ~103° (as they are stopped by the liquid) and P waves don’t arrive between ~103° and 140° due to refraction at the mantle-core boundary.
Earth Science Big Ideas:Big Idea 3
NGSS Discplinary Core Ideas:ESS2.B
NGSS Performance Expectations:HS-ESS2-1; HS-ESS2-3
NGSS Science and Engineering Practices:Developing and using models
NGSS Crosscutting Concepts:Energy and matter: Flows, cycles, and conservation; Stability and change
Subjects: 9-12; earth; earthquake; geology; high school; seismology; video
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