Which statement is true about the earth's crust? the earth's crust is uniform in thickness. the earth's crust is thinnest under the oceans. the earth's crust is thinner under the poles and thicker at the equator. the earth's crust is thinnest under mountainous regions.

iii. and iv. only is the right answer

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.