B3 scientists have determined that peak 4 is 7.0 million years old. the center of the ridge is 0 years old. using transect d, calculate the spreading rate (rate at which the sea floor is spreading). give your answers in km/ million years. be sure to show all your work, hint: calculate the spreading rate on each side of the ridge to get the two half-spreading rates and then add them together to get the full-spreading rate km/million years show your work here:

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.

the rub-al-khali is also known as the arabian desert and the "empty quarter"