A geographer researching surface lakes would focus ona geographer travels to a jungle that scientists have not yet thoroughly explore she creates a map of the jungle that identifies its most important landforms bodies of water and natural resource deposits she hopes future explorers will be able to use her map as a reference for further exploration the geographer and the passage is focused on what which type of physical feature

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.

a and b because with the other three, they simplify to something else.