bed form
河槽形状比 stream channel form ratio
随后，河槽逐渐干涸，风吹着大地，侵蚀地面，数百万年，甚至几十亿年，河槽退化为山脊形状。
Subsequently they dried up and wind eroded the ground around the channels over millions, maybe even billions, of years, leaving the more resistant channel rocks as ridges.
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