Final answer:
The adverb in the sentence is 'tomorrow'.
Step-by-step explanation:
The adverb in the sentence 'A full moon will occur tomorrow' is 'tomorrow'.
Adverbs are words that modify verbs, adjectives, or other adverbs and typically answer questions such as how, when, where, or to what extent.
In this case, the adverb 'tomorrow' modifies the verb 'occur' and provides information about when the full moon will happen.
Learn more about Adverbs