Untitled Document List of Slides for Mt. Rainier NP Mt. Rainier is reflected in Eunice Lake. Sunset light illuminates the summit . Surface waters flow down and outward from the summit of the volcano, forming a radial drainage pattern around Mt. Rainier. Bow Canyon is a narrow part of Cowlitz Gorge, near Cowlitz Glacier.
Glaciated surfaces show evidence of abrasion and plucking to form roches moutonnes.
Nisqually Glacier flows down the southern side of the mountain. Emmons Glacier, the largest in the park, originates at the summit and descends to the White River. Columnar basalt forms as lava flows cool and contract. Here the polygonal ends of columns are visible in a basalt flow on a slope Much of the volcanic rock of Mt. Rainier is andesite - intermediate in composition. Climbers trail up the side of Mt. Rainier in the Sunrise area .