The purpose of this passage is a) to teach about early european explorers. b) to describe a historic site and its builders. c) to tell which places to visit in north america. d) to explain how to build and preserve ancient artifacts.

because it's a cool name

explanation:

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.