What must happen for most areas on Earth to experience all four seasons?

Earth’s axis is tilted about 23.5° relative to its orbit, and that tilt stays pointed in nearly the same direction as Earth revolves around the Sun. This makes each hemisphere receive changing amounts and angles of sunlight during the year, creating the seasons. The Sun’s highest point or the north end of Earth’s axis pointing away from the Sun is not required for all four seasons.

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