Question

Define the terms : (i) geographic axis
(ii) geographic meridian (iii) geographic
equator (iv) magnetic axis (v) magnetic
meridian (vi) magnetic equator.​

Answer 1

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(i) Geographic axis : The imaginary line through the centre of the Earth about which the Earth spins is called the geographic axis.

[Note : Its northern end on the Earth's surface is called the North Pole or the 90° N latitude. Likewise, its southern end is called the South Pole or the 90'S latitude.]

(ii) Geographic meridian: The vertical plane at a place through the geographic North and South Poles (i.e., containing the geographic axis) is called the geographic meridian at that place,

(iii) Geographic equator : The great circle (0° latitude) on the Earth's surface, in a plane perpendicular to the geographic axis and passing through the Earth's centre, is called the geographic equator.

iv) Magnetic axis. :-The wis or the dipolar geomagnetic field is called the magnetic axis of the Earth or the geomagnetic axis. Its northern and southern ends on the Earth's surface are called the north magnetic pole and south magnetic pole respectively. It is inclined at 11.3 to the geographic axis.

(v) Magnetic meridian: The vertical plane at a place passing through the north and southnmagnetic pole and containing the magnetic axis (ie, containing the direction in which a compass needle sets itself at that place) is called the magnetic meridian at that place.

(vi) Magnetic equator : The great circle on the Earth's surface in a plane perpendicular to the geomagnetic axis is called the magnetic equator. On the magnetic axis, the dip is zero. In India, the magnetic equator passes through the town Kollam near Thiruvananthapuram.

Answer 2

Answer:

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