Part 1 of 5 · freeIntroduction
Oceans cover more than 70% of the planet. On average, a liter of seawater holds about 35 grams of salt. That is no accident: it is the result of a very long process.
Salt does not fall ready-made from the sky. It travels down from the continents, then stays trapped in the ocean.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2Salt comes from the land first
- 3Why rivers are not salty
- 4Salt also keeps the oceans moving
- 5Not the same salt everywhere
Open-book quiz8 questions whose answers are in the text.
Glossary8 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
