Week 3 of Astronomy Notes
Week 3 of Astronomy Notes AST 101
U of M
Popular in Introductory Astronomy
Popular in Astronomy
This 3 page Class Notes was uploaded by Kassandra Murawski on Thursday October 8, 2015. The Class Notes belongs to AST 101 at University of Minnesota taught by Terry Jones in Summer 2015. Since its upload, it has received 19 views. For similar materials see Introductory Astronomy in Astronomy at University of Minnesota.
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Date Created: 10/08/15
Characteristics of World from Space 0 00 0 00 0 0 0 0 00 00 00 00 0 0 0 0 00 00 00 00 0 00 Water 0 Thin scumy lm on surface 0 Makes up less than 1 percent of volume on the earth Atmosphere 0 Only few miles thick Clouds Land Plant life Mountains 0 Mostly young Round Ice Large moon Very few impact craters 0 Surface is very young because the land is active volcanoes and erosion Erosion prevents impact craters and too high of land mountains Newton39s Law of Gravity Mass of Earth 0 Size mass 43piRquot3P volume of sphere 0 Density 55 gmcc Water 1 gmcc Rocks 3 gmcc Metals 7 gmcc Seismic waves 0 P waves Compression waves longitudal waves straight o S waves Back and forth up and down transverse waves wavy squiggly 0 Cannot travel through liquid If there is an earthquake you cannot measure the S wave to the other side and the P wave bends does not go through one side and come out on the same line on the other This implies that the center of earth is liquid 0 60 Earth is differentiated into layers 0 First is a very thing quotplasticquot layer called the 0 Next is the which is silicate rock Largest part of earth39s makeup 0 Then there is a sharp boundary between the mantle and the outer core is molten iron and nickel is solid iron an nickel Still hot just very pressurized Plate Tectonics kt Convection 0 Hot material rises o Cools 0 Cool material falls back kt When one lighter plate goes on top of another heavier molten builds up and mountainsvolcanoes form oz When plates rub against each other and snaprelease earthquakes occur Japan and California have a lot of earthquakes because they are right on boundary of tectonic plates Hot magnesium wells up Cool material falls back down 393 Transport Energy 0 Conduction Mantle of earth does not conduct very well 0 Radiation Energy from sunlight and mantle does not get light 0 Convection A L upwelling 1 down cool l C Creates midocean ridges Gravity hot Earth is very Outer core Hawaii is an example of Paci c plate moving over time Plate 0 O gt Lava builds up to create each island and then the islands erode over time and get smaller oz Water does not have huge effects on mountains because mountains are being pushed up while water is causing erosion oz Glaciers carve rock and make a valley 0 They then melt 0 Ex Glacier Valley in Alaska ozo Note there was a meteor that made a crater in the Canadian shield so it is not impossible by any means that space material cannot hit the earth and that is why we do not have remnants of it