ice water
Water is hottest.
Solid water is called ice.
It is not necessary.
Adding salt to ice lowers the freezing point of water, causing the ice to melt. This process requires energy, which is absorbed from the surroundings, making the ice colder.
When ice transforms to water, it is called melting. If it is dry ice, and it evaporates, that is called sublimation.
Adding salt to melting ice lowers the freezing point of water, causing the ice to melt at a lower temperature. This results in faster melting of the ice.
Adding salt to ice lowers the freezing point of water, causing the ice to melt. This process requires energy, which is taken from the surroundings, making the ice colder.
Water tend's to crack and melt the ice, depending on the temperature it's at, it could freeze almost instantly.
Either attach something heavy to the ice, or play with the density of the water, or of the ice (adding something to it).
Adding salt to ice water lowers the temperature at which the ice water freezes. This is because the salt disrupts the normal freezing process by interfering with the formation of ice crystals. As a result, the ice water becomes colder than it would be without the salt, allowing it to remain in a liquid state at a lower temperature.
Water below the surface is called groundwater. It is found in aquifers underground and is an important source of drinking water and irrigation for agriculture.
Solid water is called ice.