Discussion
The earth wobbles slowly as it spins on its axis. This is known as :
Answer: A
The slow wobble of the Earth's axis is called Precession.
The gravitational pull of the Sun and Moon on the Earth's equatorial bulge makes the spin axis trace out a cone, like a wobbling top, over about 26,000 years. Combined with orbital changes, this produces the climatic precession cycle of about 19,000-23,000 years, one of the Milankovitch cycles.
Obliquity is the tilt of the axis, varying between about 22.1° and 24.5° over 41,000 years; eccentricity is the changing shape of the orbit over about 100,000 years; and 'variability' is not an orbital parameter.
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