Final answer:
In this sentence, the linking verb is 'materialize' and the predicate noun is 'dust devils and tornadoes'.
Step-by-step explanation:
In the sentence 'Dust devils and tornadoes, which look nearly the same, materialize under different weather conditions,' the linking verb is 'materialize.' The predicate noun is 'dust devils and tornadoes' which refers to the subject of the sentence. Predicate adjectives are not present in this sentence. Predicate nouns and predicate adjectives are part of the predicate, which consists of all the words in a sentence that are not part of the subject.
Learn more about Linking Verbs, Predicate Nouns, Predicate Adjectives