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GEOL101 pg 37-55 outline

GEOL101 pg 37-55 outline - January 23/25 37-55 350-360 A...

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January 23/25 – 37-55, 350-360 A magnetic field is a region affected by the force emanating from a magnet. Earth’s magnetic field is largely a DIPOLE, meaning it has a north and south pole. Solar winds interact with Earth’s magnetic field, distorting it into a huge teardrop pointing away from the sun. The magnetic field acts as a shield against the solar wind – the region inside the magnetic shield is called the magnetosphere. Closer the Earth, the field creates Van Allen belts - Van Allen radiation belts protects life on Earth from cosmic rays that emit dangerous radiation. Some charged particles make it past the Van Allen belt and are channeled along magnetic field lines to polar regions of the Earth. When these particles interact with gas atoms in the upper atmosphere, they cause the gases to glow. Atmosphere Consists overall of 78% nitrogen, 21% oxygen. The weight of overlying air squeezes on the air below and thus pushes gas molecules in the air below closer and closer together. Both the density and air pressure decrease with increasing elevation.
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