Alexander is writing a paper about the Lewis and Clark expedition, focusing on a critical decision. When the party arrived at a fork in the river in June 1805, the crew believed the north fork was the proper route; Captains Lewis and Clark thought the south course would get them to the Pacific Ocean. Alexander looks at the area on Google Earth.Com, which helps him understand the geography of this part of Montana. Alexander decides to supplement his paper with a visualization from Google Earth. He has a complete set of Lewis and Clark’s maps, in JPEG format, from their journey. He carefully overlays their maps onto the im- ages in Google Earth, adding placemarks for important milestones.

Once he has the journey superimposed on the satellite images, Alexander creates a screencast of himself navigating across the country toward the coast, following the route that the explorers took. His screencast narration touches on the events and circumstances that led to the decision at the fork near what is now the town of Great Falls. The images help explain the quandary the party found themselves in, as well as how they came to know they made the correct choice of the southern fork. Alexander also shows where the north fork would have taken the explorers and includes a hypothetical scenario about the difficulties the group would have encountered had they gone that way.

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