The process whereby a substance changes from a solid to liquid when heat is applied, is called?
Evaporation
Vaporization
Fission
Fusion
Explanation
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Yeah, the answer is Fusion.
In this context, it's also known as melting.
IN NUCLEAR PHYSICS, fusion means joining of atomic nuclei. But this question is not nuclear physics. 
Explanation:
Fusion (also called melting) is the process where a solid changes into a liquid when heat is applied.
Example: Ice → water
Other options:
A. Evaporation → liquid → gas at surface
B. Vaporization → liquid → gas (includes boiling and evaporation)
C. Fission → splitting of an atom or nucleus (nuclear process)
Key point: Solid → liquid = Fusion / Melting
Fusion is correct. Heat of fusion is the same for melting and freezing because same heat you apply to melt is the same you take away to freeze. Fission only occurs when there's change in mass and particles are completely separated and
