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World 3 · Lightning and Thunder · 11 min · PRO

Thunder and distance: count the seconds

The flash-to-bang rule

PRO · Storm Chaser

World 3: Lightning and Thunder is part of PRO

The first world of Storm Chaser is free. PRO opens the other 22 lessons in 6 worlds — simulations, quizzes and all.

  • Charging a cloud: where lightning begins
  • The flash: leader and return stroke
  • Lightning safety: when thunder roars, go indoors
  • Growing a hailstone: up and down the updraft
  • Sizes and updrafts: why bigger hail needs stronger storms
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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