SECOND LETTER "X"
'(<a href="http://www.j-archive.com/media/2009-06-25_DJ_24.jpg" target="_blank">Jimmy of the Clue Crew shows a diagram of a winding river on the monitor.</a>)  Due to erosion, large river bends called meanders <a href="http://www.j-archive.com/media/2009-06-25_DJ_24a.jpg" target="_blank">loop together</a> & are eventually cut off from the rest of the river, becoming <a href="http://www.j-archive.com/media/2009-06-25_DJ_24b.jpg" target="_blank">this</a> type of U-shaped lake'
an oxbow