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28 Copyright © Randy Schaetzl 2002
Horn, Canadian Rockies near Banff, Alberta. Copyright © Randy Schaetzl 2002

29 Grinnell Lake with the Grinnell Glacier rock step, cirque, and headwall in the upper right, view from Grinnell Glacier Trail, Glacier NP. Copyright © Bob Andrle 2002

30 Copyright © Carol Harden 2002
U-shape of the valley of the Tomebamba River, upstream and west of Cuenca, Ecuador.  The valley shape (in addition to cirques and tarns and moraines upstream) provides evidence of glaciation, which occurred here during the Pleistocene.  Active glaciers still exist at higher altitudes in Ecuador, including on the mountain Cayambe, which sits on the Equator. Copyright © Carol Harden 2002

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