Final answer:
The verb 'blew up' in the provided sentence is an action verb as it describes an action carried out by the subject 'wind'. Linking verbs connect subjects to further information.
Step-by-step explanation:
In the sentence "The strong wind blew up the old tree", the verb 'blew up' is an action verb, not a linking verb. Action verbs describe something a subject does or performs, which in this case is the wind blowing up the tree. On the contrary, linking verbs do not indicate actions. Instead, they connect the subject of a sentence to further information about that subject. Examples of linking verbs include 'is', 'are', 'were', 'seem', and 'become', among others.
Learn more about Action Verb