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World 4 · Currents and the Conveyor · 8 min · PRO

Upwelling and fisheries

Where the food comes back up

PRO · Ocean Deep

World 4: Currents and the Conveyor is part of PRO

The first world of Ocean Deep is free. PRO opens the other 23 lessons in 6 worlds — simulations, quizzes and all.

  • Salt and heat set the density
  • The wind-driven surface currents
  • The global conveyor belt
  • Anatomy of a wave
  • Deep water, shallow water
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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