Most of the ocean doesn’t freeze. Why? Salt water freezes at a lower temperature than fresh water.
1. Soak your thread in some water then lay it on top of an ice cube.
2. Sprinkle a tiny bit of salt along the thread and wait about 30 seconds.
3. Lift the thread. Does the ice cube cling to the thread and get lifted as well?
Explanation: The salt melts the surface of the ice. The coldness of the ice then refreezes this water, trapping the thread and freezing it to the ice.