<p>(1 in a multiple picture album)
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For thousands of years Mother Nature has been carving this alcove in a giant wall at Zion National Park. Rain on the mesa above seeps down through the porous sandstone until it finds a spot to rest. Then it slowly dissolves the matrix which holds the sandstone together.  After awhile a slab of stone falls off the weakened cliff and that is the start of an alcove. Thousands of year from now that cliff may be just a pile of sand. Mankind, think how weak and small you are!
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/23155134@N06">Don Graham</a> from Redlands, CA, USA - God bless it!
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/23155134@N06/17568606092/">Alcove Fly Over, Zion NP 4-14</a>