The motion of a glacier was outward in all directions from its origin, and the speed of its motion depended on the slope of its surface, not on the slope of the ground underneath. If the surface slope was great, the water within the glacier flowed downhill faster through the chinks in the ice and spread out the ice as it refroze. They grew faster when they were young, near large oceans or seas, or in mountains where the high peaks assured heavy snowfall. They slowed down after they spread out, their broad surface reflecting the sunlight away and the air above the center turning colder and drier with less snow.
( Jean M. Auel )
[ The Plains of Passage ]
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