Page 19 - Curriculum Visions Dynamic Book

 The sandstone in this rock sample was deposited in a shallow sea. The ripples are still visible.
 Sand dunes in Death Valley, California, USA.
weathering: the slow natural processes that break down rocks and reduce them to small fragments either by mechanical or chemical means.
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 Iron oxide cements are very durable because they are resistant to weathering. The high red sandstone cliffs of the Canyonlands of the southwest United States, for example, including the cliffs of the Grand Canyon, bear witness to this.