<human>:  In the book, ‘Across the Rocky Mountains’, why did the author use the word ‘soon’ so many times?
<bot>: “Soon” is an adverb that means “immediately” or “very soon”. It is often used in place of the word “quickly” or “quickly”. The author is using “soon” to mean “quickly” because they want to get across to the reader that the journey was very quick.