Which one would be correct in the following sentence.

What is the (affect or effect) of freezing temperature on water?

Most of the time in common English usage, "affect" is a verb and "effect" is a noun. The word "the" immediately in front of the choice indicates that a noun is expected.

What do you think?

Since the word is a noun in this sentence, the correct word is effect.

Check this site.

http://www.yourdictionary.com/grammar-rules/affect-effect-grammar.html

To determine whether to use "affect" or "effect" in this sentence, we need to understand the difference between the two words.

1. "Affect" is typically used as a verb and means to influence or have an impact on something.
2. "Effect" can be used as both a noun and a verb. As a noun, it refers to the result or consequence of an action. As a verb, it means to bring about or cause.

In the given sentence, we're looking for a noun to describe the result or consequence of freezing temperature on water. Therefore, the correct word to use is "effect."

To confirm this, you can independently look up the definitions of "affect" and "effect" in a dictionary or consult a grammar guide.