What is the exposition of dead poets society?

Which element would be most appropriate for a multimedia presentation on the causes of animal extinction

[he] let his gaze wander to the swirling water of the stream racing madly beneath his feet. a piece of dancing driftwood caught his attention and his eyes followed it down the current. how slowly it appeared to move! what a sluggish stream! what contrasting words are used to describe the stream in this passage?

Based on the map, which arabian city will marco polo describe after kalhat if he continues northwest across the arabian sea?