Final answer:
The verb 'blew' in the sentence is intransitive, as it does not require a direct object to complete its meaning.
Step-by-step explanation:
The sentence 'The cold wind blew across the prairie' contains an intransitive verb. An intransitive verb does not require a direct object to complete its meaning; it makes sense without one. In this sentence, 'blew' is the verb and it doesn't need a direct object, as the action does not pass onto an object. Instead, the verb is followed by adverbial information that describes where the wind blew, which satisfies the structure: (subject)+(intransitive verb)+(optional adverbial).