What is the primary cause of the distinct seasons experienced across the globe?
Answer
The tilt of the Earth's axis relative to the plane of its orbit
The approximately $23.5^{\circ}$ axial tilt causes different hemispheres to receive more direct sunlight at different times of the year as the Earth revolves, which is the primary driver for seasonal changes.
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Movements of the Earth - Earth's Revolution & Rotation - YouTube
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