What is the name of the process when a liquid turns into a solid?

A mild household disagreement over son's Sats homework (aged 11!). We think solidify, but encyclopedia and dictionary both say freezing.

What is the name of the process when a liquid turns into a solid?
The answer is Freezing or Solidification.





The act of freezing is a PHYSICAL change and only takes place when a substance has reached its solidification temperature but remains a liquid. (Like water at 0掳C)





The REMOVAL of 'Latent Heat' of freezing is what causes the substance to solidify but, the temperature does not change.





(For water, the Latent Heat of Freezing (Water@0掳C to Ice@0掳C = 334 kJ/kg:





(It is different for different substances).
Reply:I am pretty sure that the process is freezing. It says so in my science textbook. Freezing is a chemical change, and applies to every time a liquid turns into a solid.
Reply:Freezing is the proper term.
Reply:At age 11 I think freezing will be a fine answer. I think freezing implys a process rather than a certain condition. Increasing pressure on water and causing it to turn into ice will also drop in temperature, so freezing is just the process of turning the liquid into a solid.
Reply:It could either be solidification or freezing.
Reply:It is solidifying. Freezing implies a drop in temperature according to the freezing point of the liquid, but liquids can also be solidified by compression. Pressure increases which forces the atoms to move closer together, solidifying the liquid.