GEO 151 WA1 Essay

1322 Words Nov 5th, 2013 6 Pages
1. What are the relationships among Earth's mantle, crust, asthenosphere, and lithosphere?

The lithosphere is basically the strong outer shell of earth. It is roughly 100km thick depending on its age, and is broken into plates, known as the tectonic plates. Within the lithosphere is the crust as a portion of the upper mantle.
The crust is the outer most portion of the earth and takes up less than 1% than the total volume of the earth. It is commonly compared to the skin of an apple, whereas the apple represents the earth. The temperature of the crust varies from the air on top, to upward of 1600 at the deepest parts. The tectonic plates are part of the crust of the earth, moving and shifting on the softer mantle or
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The magnetic field is formed by electrical charges at the earth’s core. The field protects the earth from solar winds and radiation which among other things would strip away the ozone. This interaction of solar winds and the magnetic fields is actually visible in the northern regions of the US, on a clear night the lights shine in a variety of colors, known commonly as the “northern lights”. The earth’s magnetic field is a result of currents of metal in the core. Swirling molten metal around the solid metal core of the earth creates a magnetic field.
The earth’s magnetic poles are basically where the magnetic field is coming vertical off the surface of the earth. Inclination is used to determine the location of the magnetic poles. The earth's field inclination is 90° at the North Pole and -90° at the South Pole. The earth has two poles, a north pole and a south pole. Compasses used for guidance point to the north pole, and although the north pole is close, it is different from the geographic north pole so compasses used around the poles aren’t very useful. The magnetic poles move around, caused by the ever changing molten metal around the core. Over the 20th century estimates suggest the pole moved over 1100km. Seemly more strange are the magnetic poles can reverse, causing the North Pole to be in the south and the South Pole to be in the north.

4. Differentiate between seamounts, guyots,

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