Analogy: melting is to freezing as partial melting is to _______?

a. partial freezing
b. magma.
c. boiling.
d. fractional crystallization.

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partial freezing

To find the answer to this analogy question, we need to understand the relationship between melting and freezing. Melting is the process of changing a solid substance into a liquid state, while freezing is the reverse process where a liquid substance turns into a solid state. These two terms are opposite actions.

Now let's consider the term "partial melting." Partial melting refers to the process where only a portion of a substance melts while the rest remains in a solid state. To find the analogous term, we need to identify the opposite action to partial melting.

The opposite of partial melting, where only a portion melts, would be a situation where only a portion of a substance freezes while the rest remains in a liquid state. This process is known as "fractional freezing," option (d) - fractional crystallization.

Therefore, the correct answer to the analogy is d. fractional crystallization.