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World 6 · Ice Cores: Reading Old Air · 11 min · PRO

Why the ice ages come and go: Milankovitch cycles

Three slow wobbles of the Earth's orbit

PRO · Landscape Lab

World 6: Ice Cores: Reading Old Air is part of PRO

The first world of Landscape Lab is free. PRO opens the other 21 lessons in 6 worlds — simulations, quizzes and all.

  • Layers of snow: drilling a core
  • 800,000 years of CO₂: the record
  • River or glacier? Reading valleys
  • Water below ground: caves, sinkholes and springs
  • Which process made this? Field-guide challenge
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