I want to know the answer to the following question:
Why are some glaciers stagnant in Alaska?
All the background I'm provided with is that "In other cases, glaciers can move as fast as 20–30 m (70–100 ft) per day, such as in Greenland's Jakobshavn Isbræ (Greenlandic: Sermeq Kujalleq).". Is that enough to answer the question?