The uneven distribution of insolation by latitude is primarily a result of

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Earth's sphericity causes varied angles of incidence of solar radiation at different latitudes, resulting in uneven distribution of insolation. The curvature of the Earth's surface causes solar rays to strike the planet's surface at different angles at different locations. At the equator, incoming solar radiation is more direct, while at the poles, it is more oblique. This fact leads to a variation in the amount of solar radiation received at different latitudes on Earth.

The Uneven Distribution of Insolation by Latitude Is Primarily a Result