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Yardang
A rock that has evolved a wind-resistant form due to wind erosion. The longer axis of the rock’s wind-resistant feature is aligned with the main wind direction.

Yardang
Word of the day
Upper Mantle >> The upper mantle of the Earth’s crust is partially fluid, and because of this, the lithosphere is broken up into tectonic plates that move. This is also known as the asthenosphere.