Does the following sentence have any adverbs? If so, where?: Many explorers searched endlessly for new lands.
Endlessy says something about a verb.
*An adverb is a word that modifies a verb, adjective, another adverb, determiner, noun phrase, clause, or sentence. (wikipedia)
Many explorers searched endlessly for new lands.
Adverbs are words that modify or describe verbs, so in this case the word endlessly describes:
1. How did the explorers searched for new lands?
2. In what manner did the explorers search for new lands?