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World 4 · Why Leaves Change Colour · 10 min · PRO

Evergreen or deciduous?

Two winter strategies

PRO · Tree & Forest Lab

World 4: Why Leaves Change Colour is part of PRO

The first world of Tree & Forest Lab is free. PRO opens the other 20 lessons in 5 worlds — simulations, quizzes and all.

  • Pigments
  • Autumn chemistry
  • Letting go
  • Catching light
  • Sun leaves and shade leaves
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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