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With reference to the Earth's magnetic poles, consider the following statements:
1. The magnetic poles are stationary and do not change over time.
2. The magnetic poles coincide exactly with the geographic poles.
Which of the statements given above is/are correct?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
• Earth's magnetic field — also known as the geomagnetic field — is generated in our planet's interior and extends out into space, creating a region known as the magnetosphere. • Without the magnetic field, life on Earth as we know it would not be possible as it shields us all from the constant bombardment by charged particles emitted from the sun — the solar wind. • Earth has two sets of poles, geographic pole and magnetic poles. Earth's magnetic field can be visualized if you imagine a large bar magnet inside our planet, roughly aligned with Earth's axis. o Each end of the magnet lies relatively close (about 10 degrees) to the geographic North and South poles. Earth's invisible magnetic field lines travel in a closed, continuous loop and are nearly vertical at each magnetic pole. Hence statement 2 is not correct. • Geographic North and South poles are where lines of longitude converge. The Geographic North Pole is located in the middle of the Arctic Ocean and the Geographic South Pole is found in Antarctica. • Magnetic poles are located where the magnetic lines of attraction enter Earth. The Magnetic North Pole is also known as the North Dip Pole and is currently found on Ellesmere Island in Northern Canada. When a magnetic compass points north it is aligning itself with Earth's magnetic field and points to the Magnetic North Pole, not the Geographic North Pole. • Earth's magnetic field is not fixed; it is dynamic and has undergone significant changes throughout geological history. This phenomenon is known as geomagnetic pole drift or magnetic field reversal. • Geomagnetic Pole Drift: The positions of Earth's magnetic north and south poles are not stationary. Instead, they slowly migrate and shift over time. This gradual movement of the magnetic poles is called geomagnetic pole drift. The poles can move several kilometers per year in different directions, primarily due to complex processes occurring in Earth's molten outer core. • Magnetic Field Reversals: Geological records and studies of ancient rocks show that Earth's magnetic field has undergone reversals. In a magnetic field reversal, the magnetic north pole becomes the magnetic south pole, and vice versa. Hence statement 1 is not correct.
By: Parvesh Mehta ProfileResourcesReport error
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