侵蚀磨损山体使之高度下降。但是活跃的山脉也同样不断在上升。
Erosion wears mountains down, but active mountain ranges are also continuously rising.
磨损作用也助长了风的侵蚀。
如此的侵蚀可能磨损出峡，或峡谷。科罗拉多河大峡谷是世界上最大的河流峡谷。
Such erosion may cut a gorge or canyon. The Grand canyon of the Colorado river is the largest river canyon in the world.
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