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Which requires the removal of heat, melting or freezing?
Is it evaporation? What is it? Why?

Sagot :

Freezing. If you take away energy from something, (lower its temperature), it will freeze. If you add heat to something, it will melt if it is a solid and evaporate if it is a liquid.

When you add energy to something, the atoms which comprise the substance jiggle and vibrate, meaning that on a large scale, a solid will become a liquid, and a liquid will become a gas.
Freezing, just think about it, the colder it gets the more likely there is going to be snow/ hail/ ice