Final answer:
A book describing Christopher Columbus sailing to America is a secondary source.
Step-by-step explanation:
In the context of a book describing Christopher Columbus sailing to America, the book is considered a secondary source.
A primary source is an original document or firsthand account of an event. In the case of Columbus, primary sources would include letters and journals written by Columbus or people who were with him on his voyages.
A secondary source is a document or account that is created after an event has occurred and is based on primary sources. It provides interpretation, analysis, or commentary on the primary sources. A book written about Columbus would fall into this category as it is not a firsthand account, but rather a historian's interpretation of the events and information available about Columbus.
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