Oceanic crust choose one: a. is composed of gabbro and basalt overlain by sediment. b. gets younger the farther you go from the ridge axis. c. is thicker and denser than continental crust. d. comprises broad continental shelves along active continental margins and much narrower shelves along passive margins.

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.