Key Information
Ice
| Type | Frozen Water |
| Freezing Point | 0 °C, 32 °F, or 273.15 K |
| Structure | Hexagonal crystalline structure |
Learning Point
- Ice is far more than just frozen water; it is a complex, crystalline structure (H2O) that shapes our planet’s climate and geology. Unlike most substances, water expands when it freezes, creating a unique hexagonal lattice that makes ice less dense than liquid water, allowing it to float. This property is vital for life, as it prevents bodies of water from freezing solid. From massive glaciers that carve mountains to polar ice sheets that reflect sunlight and regulate global temperatures, ice acts as a critical climate regulator and a historical record of Earth’s atmosphere trapped within ancient, frozen bubbles.
Project
- Draw a picture of an ice crystal or a scene of ice near your home.
- Overview
- Structure
Location
| Location | Worldwide |
Fun Facts
- Most things get smaller when they freeze, but water is special—it puffs up and expands! This makes ice less dense than liquid water, which is why ice cubes float in your drink instead of sinking to the bottom.
- When ice forms over thousands of years in places like Antarctica, it traps tiny bubbles of air. Scientists drill down to grab these “ice cores” to see what the air smelled and felt like hundreds of thousands of years ago.
- Antarctica is covered in so much ice that it holds about 70% of all the fresh water on Earth. If all that ice melted at once, the level of the oceans would rise a huge amount!
- Even when it is super cold outside, glaciers are always on the move. They are so heavy and powerful that they slowly slide downhill, carving out giant valleys and reshaping mountains like a giant icy bulldozer.
- Not all ice is made of water! In space, there are “ice giants” like Uranus and Neptune that have icy layers made of things like methane and ammonia, and here on Earth, we use “dry ice,” which is actually frozen carbon dioxide.
Past Lessons
| 193 | April 6, 2026 | (North America) |