Question

The palau islands are located in the north pacific ocean, where old coral reefs rose above the sea. Where is the adverb clause?

Answer 1

The adverb clause is, where old coral reefs rose above the sea.

Answer 2

where old coral reefs rose above the sea

Step-by-step explanation:

A clause introduced by the relative adverb where has an adverbial function, in this case modifying the complement of the verb "are located" in the main sentence, which is a prepositional phrase working as an adverb: "in the north Pacific Ocean." Adverbs are by definition modifiers of verbs, adjectives or other adverbs.