Likewise, glaciers have existed in the mountains ever since the ice age, but glacier flow moves the snow and ice through the entire length of the glacier in 100 years or less.
(glaciers; have existed; L:in the mountains; T:ever since the ice age) (glacier flow; moves; the snow and ice; through the entire length of the glacier)
glaciers glacier flow
have existed moves
L:in the mountains T:ever since the ice age
the snow and ice through the entire length of the glacier