The prepositional phrases are "Within minutes" and "near the Tunguska River".
Explanation:
Prepositional phrases are those phrases or groups of words that contain a preposition and an object, along with any word that modifies the object. The prepositional phrase starts with a preposition and can modify a noun or a verb.
In the given sentence, there are two prepositions used- "within" and "near". And these two prepositions also have objects in them.
Thus, the prepositional phrases in the sentence are <em>"within minutes"</em> and <em>"near the Tunguska River"</em><em>.</em>
Changing the sentence structure and how quickly the events unfold in a story will change the pace of the story. When we're changing the speed of how the story progresses from 10 page long descriptions of certain items and things to one page descriptions of a whole week going by, we dramatically influence the speed of the story and with that its pace.
