World 3 · Life Without Sunlight · 8 min · PRO

Marine snow

Food falling from above

PRO · Ocean Deep

World 3: Life Without Sunlight 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.

Vents in the dark
Chemosynthesis
Falls and seeps
Salt and heat set the density
The wind-driven surface currents

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