Part 1 of 5 · freeIntroduction
An ice cube in a glass, an iceberg in the ocean: ice floats. It looks ordinary. Yet for most substances the solid form is denser, heavier for the same volume, so it sinks.
Water does the opposite. The exception comes from the shape of its molecule. And it has saved a great many lakes in winter.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2A molecule shaped like a V
- 3Freezing water takes up more room
- 4Why this is vital for lakes
- 5And for the climate too
Open-book quiz8 questions whose answers are in the text.
Glossary11 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
