UPSC GEOGRAPHY

■ 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

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