CNN News:被误解的冰川 其实我在移动

Where would you find three-quarters of Earth's freshwater? Great Lakes, glacier ice, global rivers or ground water.
Glacier ice is the world's second largest water reservoir and it's biggest freshwater reservoir.

Glaciers cover about 10 percent of the world's total land area. And when you think of them what might come to mind are these super massive chunks of immovable ice. But some of them are anything but. Gem Glacier the smallest one in Montana's Glacier National Park covers only about five acres which is like five football fields. And the Alaska Almanac states that the state of Alaska alone is home to 100,000 glaciers. Also, they move, maybe not so fast that you can watch them drift like a boat over water. But whether glaciers are crunching downwards through valleys or spreading away from a central point, these ice masses slip, slide, creep and crawl across the surface. Scientists say most of the world's glaciers are shrinking though some are getting larger. And investigations are taking place worldwide.