|
||||||
|
|
||||||
|
||||||
|
|
||||||
 |
 |
 |
 |
|
|
|
|
||
 |
Columbia Glacier in Alaska encroached on a forest as it surged in the early twentieth century, pushing trees, soil, rocks and debris as it advanced. This photograph was taken in 1914, several years after the glacier had begun to surge. Columbia Glacier is located in the Chugach Mountains of Alaska.
(Source: D. K. Handy photograph at the World Data Center for Glaciology, Boulder)
