UPSC GEOGRAPHY

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■ COMPASS #Magneticfield ◇ A compass point north because all magnets have two poles, a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet. ◇ The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. ◇ Because the Earth's Magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field. ◇ While a compass is a great tool for navigation, it doesn't always point exactly north. This is because the Earth's magnetic North Pole is not the same as "true north (Earth's Geographic North Pole)." ◇ Although the magnetic declination (deviation from true north) does shift with time, this wandering is slow enough that a simple compass remains useful for navigation. ▪︎JOIN - @upsc_geography_notes

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■ NORMAL AND REVERSE FIELD #Magneticfield ◇ The Earth's field has alternated between periods of normal polarity, in which the predominant direction of the field was the same as the present direction, and reverse polarity, in which it was the opposite. ◇ In Normal Polarity, Earth’s North Magnetic Pole is the South Pole of its Magnetic Field. In Reverse Polarity, Earth’s North Magnetic Pole is the North Pole of its Magnetic Field. ▪︎JOIN - @upsc_geography_notes

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■ GEOMAGNETIC REVERSAL #Magneticfield ◇ A geomagnetic reversal or a reversal in earth’s magnetic field is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. ◇ Based on palaeomagnetism (is the study of the record of the Earth's magnetic field in rocks, sediment, or archaeological materials). ◇ It is observed that over the last 20 million years, magnetic north and south have flipped roughly every 200,000 to 300,000 years. ◇ The reversal is not literally 'periodic' as it is on the sun, whose magnetic field reverses every 11 years. ◇ The time between magnetic reversals on the Earth is sometimes as short as 10,000 years and sometimes as long as 25 million years. ◇ And the time it takes to reverse could be about a few hundred or a few thousand years. ◇ The magnetic poles emerge at odd latitudes throughout the process of the reversal. ▪︎JOIN - @upsc_geography_notes