John Stuart Mill Essays (341 words) - Classical Economists

John Stuart Mill After reading 100% of the book, New Ideas From Dead Economists, I chose to write a little summery of John Stuart Mill. I did a little outside research on the subject, because his theories and philosophies were intriguing to me. I was impressed by his change in his views as he entered his mid twenties. John Stuart Mill was born in London on May 20, 1806, and was the oldest son of James Mill. His education, as a boy, was carried out by his father, James Mill. Johns discipline was extremely rigid, as a result, he believed it gave him the intellectual advantage of a quarter century on his contemporaries. Later in life Mill recognized that his fathers extreme system of intellectual discipline gave him little time to develop social and emotional relationships with others. He regretted this aspect of his childhood. Mill was considered a leader in thought at the young age of twenty-one. This is when he encountered a mental crisis. The cause of the crisis, extreme mental and physical strain, gave him as he called it, a dull state of nerves. He realized that the goals in his life, that his father had given him, stolen the feelings out of him. After many months of despair, he found that the emotions within him were not dead. One important factor in this emotional realization was a woman by the name of Mrs. Taylor. She was known to help Mill in authoring works of his, and a good friend. While she was married, Mill held a close relationship with her. After the death of her husband, Mrs. Taylor and John Mill were married in 1851. After this he had great success publishing in multiple literary journals. These articles had ranged from those relating to philosophy and social to political and economic. One of his earliest was with The Westminster Review, but were mostly for The London Review. Through thes e articles, we can trace his gradual development and change in his radical politics. Economics Essays

Discover the Lithosphere in Plate Tectonics

Discover the Lithosphere in Plate Tectonics In the field of geology, what is the lithosphere? The lithosphere is the brittle outer layer of the solid Earth. The plates of plate tectonics are segments of the lithosphere. Its top is easy to see its at the Earths surface but the base of the lithosphere is in a transition, which is an active area of research. Flexing the Lithosphere The lithosphere is not totally rigid, but slightly elastic. It flexes when loads are placed on it or removed from it. Ice-age glaciers are one type of load. In Antarctica, for example, the thick ice cap has pushed the lithosphere well below sea level today. In Canada and Scandinavia, the lithosphere is still unflexing where the glaciers melted about 10,000 years ago. Here are some other types of loading: Construction of volcanoesDeposition of sedimentRise in sea levelFormation of large lakes and reservoirs Here are other examples of unloading: Erosion of mountainsExcavation of canyons and valleysDrying up of large water bodiesLowering of sea level The flexing of the lithosphere from these causes is relatively small (usually much less than a kilometer [km]), but measurable. We can model the lithosphere using simple engineering physics, as if it were a metal beam, and get an idea of its thickness. (This was first done in the early 1900s.) We can also study the behavior of seismic waves and place the base of the lithosphere at depths where these waves begin to slow down, indicating softer rock. These models suggest that the lithosphere ranges from less than 20 kilometers  in thickness near the mid-ocean ridges to about 50 km in old oceanic regions. Under the continents, the lithosphere is thicker ... from around 100 to as much as 350 km. These same studies show that underneath the lithosphere is a hotter, softer layer of solid rock named the asthenosphere. The rock of the asthenosphere is viscous rather than rigid and deforms slowly under stress, like putty. Therefore the lithosphere can move across or through the asthenosphere under the forces of plate tectonics. This also means that earthquake faults are cracks that extend through the lithosphere, but not beyond it.   Lithosphere Structure The lithosphere includes the crust (the rocks of the continents and the ocean floor) and the uppermost part of the mantle beneath the crust. These two layers are different in mineralogy but very similar mechanically. For the most part, they act as one plate. Although many people refer to crustal plates, its more accurate to call them lithospheric plates. It appears that the lithosphere ends where the temperature reaches a certain level that causes average mantle rock (peridotite) to grow too soft. But there are many complications and assumptions involved, and we can only say that the temperature would be from about 600 C to 1,200 C. A lot depends on pressure as well as temperature, and the rocks vary in composition due to plate-tectonic mixing. Its probably best not to expect a definitive boundary. Researchers often specify a thermal, mechanical or chemical lithosphere in their papers. The oceanic lithosphere is very thin at the spreading centers where it forms, but it grows thicker with time. As it cools, more hot rock from the asthenosphere freezes onto its underside. Over the course of about 10 million years, the oceanic lithosphere becomes denser than the asthenosphere beneath it. Therefore, most of the oceanic plates are ready for subduction whenever it happens. Bending and Breaking the Lithosphere The forces that bend and break the lithosphere come mostly from plate tectonics. Where plates collide, the lithosphere on one plate sinks down into the hot mantle. In that process of subduction, the plate bends downward as much as 90 degrees. As it bends and sinks, the subducting lithosphere cracks extensively, triggering earthquakes in the descending rock slab. In some cases (such as in northern California) the subducted part can break off completely, sinking into the deep Earth as the plates above it change their orientation. Even at great depths, subducted lithosphere can be brittle for millions of years, as long as it is relatively cool. The continental lithosphere can split, with the bottom part breaking off and sinking. This process is called delamination. The crustal part of the continental lithosphere is always less dense than the mantle part, which in turn is denser than the asthenosphere beneath. Gravity or drag forces from the asthenosphere can pull the crustal and mantle layers apart. Delamination allows the hot mantle to rise and yield melt underneath parts of a continent, causing widespread uplift and volcanism. Places like Californias Sierra Nevada, eastern Turkey and parts of China are being studied with delamination in mind.