I think it's cold rolled steel because this type of steel as closer dimensional tolerances and wider range of surface finishes. But I'm not completely certain this is what you're looking for.
Hope this helps :)
The molecules of the solid started to loosen up and separate causing it to turn into liquid.
The frequency of waves are determined by the amount of waves that pass a specific point in a certain period of time and Radio stations broadcast their signals at different frequencies so that the range of radio frequencies can be used by many stations.
A) Personal Profile. Hope this helped!!!