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World 5 · Inside Earth with seismic waves · 8 min · PRO

Bending paths and arrival times

PRO · Plate Tectonics

World 5: Inside Earth with seismic waves is part of PRO

The first world of Plate Tectonics is free. PRO opens the other 46 lessons in 7 worlds — simulations, quizzes and all.

  • How waves reveal a liquid core
  • A skin of rock around a metal heart
  • Why a layer can vanish from a slice
  • From sandstone to gneiss
  • One magma, two textures
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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