Base your answers to questions 80 through 82 on the generalized cross section of the grand canyon
represented below and on your knowledge of earth science. some rock layers have been labeled. the rock layers
have not been overturned.
the vishnu group is composed mostly of schist. explain how this rock formed. [1]

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.