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Ribiana Sand Sea

The Ribiana Sand Sea is located in Africa's Libyan Desert. The three sand seas contain dunes up to 110m in height and cover ~25% of the Libyan Desert. The dunes were created by the wind.

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Quadratic formula

... get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof remain correct ...