"Did you know?" "Geologists estimate that the granite at Mount Rushmore National Memorial will erode only 1 inch every 10,000 years. "

topography

r_coppelia のブックマーク 2014/03/13 15:55

<blockquote class="hatena-bookmark-comment"><a class="comment-info" href="https://b.hatena.ne.jp/entry/186260794/comment/r_coppelia" data-user-id="r_coppelia" data-entry-url="https://b.hatena.ne.jp/entry/s/www.nps.gov/moru/planyourvisit/conditions.htm" data-original-href="https://www.nps.gov/moru/planyourvisit/conditions.htm" data-entry-favicon="https://cdn-ak2.favicon.st-hatena.com/64?url=https%3A%2F%2Fwww.nps.gov%2Fmoru%2Fplanyourvisit%2Fconditions.htm" data-user-icon="/users/r_coppelia/profile.png">Current Conditions - Mount Rushmore National Memorial (U.S. National Park Service)</a><ul class="comment-tag" style="list-style: none; margin: 0px;"><li style="float: left">[<a href="https://b.hatena.ne.jp/q/topography">topography</a>]</li></ul><br><p style="clear: left">&quot;Did you know?&quot; &quot;Geologists estimate that the granite at Mount Rushmore National Memorial will erode only 1 inch every 10,000 years. &quot;</p><a class="datetime" href="https://b.hatena.ne.jp/r_coppelia/20140313#bookmark-186260794"><span class="datetime-body">2014/03/13 15:55</span></a></blockquote><script src="https://b.st-hatena.com/js/comment-widget.js" charset="utf-8" async></script>

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Current Conditions - Mount Rushmore National Memorial (U.S. National Park Service)

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