Heat melts a solid and turns it into a liquid. Cooling freezes a liquid into a solid. If water (liquid) is cooled, it changes to ice (solid). This change is called freezing. Water freezes at 0°C ...

So! Who wants another go? What happens when you heat or cool something down? Learn about melting and freezing with this video, and test what you've learned with the activity below.

Surface melting for the Antarctic ice sheet appears to have set a record for the 46-year satellite observation period on ...