Download or read book Great Sand Dunes National Monument written by Stephen Trimble and published by Western National Parks Association. This book was released on 2000 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imagine 750-foot sand dunes thousands of miles from an ocean but near the alpine peaks of Colorado's Sangre de Cristo Mountains. Great Sand Dunes' ecological environment still harbors areas where few humans have visited. Learn how the massive dunes were formed and what continues to influence their transformation into a variety of shapes.