The Earth is differentially heated. What does this mean? Describe 3 factors that influence the heating of Earth. How does differential heating allow for life on Earth? **ILL REPORT IF WRONG** Remember: JUST DO IT!

It is related to how the sun's rays strike the surface of the Earth.

At the equator, the rays strike the Earth almost perpendicular to its surface, warming up a small area. At high latitudes, the curve of the Earth causes the rays to strike a larger surface area, so the same amount of heat is distributed over a larger area. That means it does not warm up as much as at the equator.

This difference in temperature between the equator and the poles causes our atmosphere and ocean to circulate.

But in the ocean there is another effect. The sun at the equator also warms the surface ocean and causes water to evaporate. This makes the ocean more salty. In other areas, where there is a lot of rain, the ocean is less salty.

It is the combination of differences in temperature and salinity that causes the deep ocean beneath the reach of the wind to circulate.

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.

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