UPSC GEOGRAPHY

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■ MAGNETIC POLES #Magneticfield ◇ A magnet's North pole is thought as the pole that is attracted by the Earth's North Magnetic Pole when the magnet is suspended so it can turn freely. ◇ Since opposite poles attract, the North Magnetic Pole of the Earth is the south pole of its magnetic field. ◇ Magnetic dipole field (simple north-south field like that of a simple bar magnet) is usually aligned fairly closely with the Earth's rotation axis; in other words, the magnetic poles are usually fairly close to the geographic poles, which is why a compass works. ◇ However, the dipole part of the field reverses after a few thousand years causing the locations of the north and south magnetic poles to switch. ◇ The terms magnetic north and magnetic south are not to be confused with geographic north and geographic south, and geomagnetic north and geomagnetic south. ▪︎JOIN - @upsc_geography_notes

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■ EARTH’S MAGNETIC FIELD #Magneticfield ◇ A 'field' is a region in which a body experiences a force owing to the presence of other bodies. ◇ Gravitational fields determine how bodies with mass are attracted to each other. ◇ In electric fields, objects that have an electric charge are attracted or repelled from each other. ◇ Magnetic fields determine how electric currents that contain moving electric charges exert a force on other electric currents. ▪︎JOIN - @upsc_geography_notes

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■ SURGE TECTONICS #Interiorofearth ◇ Surge tectonics refers to the genesis of global surge waves caused by changes (weakening in the regional gravity fields due to upward movement of deformable magma in the surge channels in the lithosphere (crust, 100-200 km thick upper layer of the earth) lying above mantle. ◇ Strictly speaking, surge tectonics means upward motion of fluid magma in surge channels magma conduits), rise in temperature of regional oceanic water and consequent decrease in pressure and shift in regional gravity field of oceanic crust. ◇ The motions in the surge channels are caused by earth’s rotation. ◇ Magma, while rising through the surge channels, undergoes its transformation (deformation; i.e. it becomes lighter (decrease in density) and less compact and hence expands. ◇ This consequent expansion in magma reduces gravitational attraction in the surge channels and weakens the regional gravity fields. ▪︎JOIN - @upsc_geography_notes

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