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 "Glacier ( or )
is a persistent body of dense ice that
is constantly moving under its own weight. A glacier forms where the
accumulation of snow exceeds
its ablation over
many years, often centuries.
Glaciers slowly deform and flow under stresses induced by their
weight, creating crevasses, seracs,
and other distinguishing features. They also abrade rock and debris
from their substrate to create landforms such as cirques, moraines,
or fjords.
Glaciers form only on land and are distinct from the much thinner sea
ice and
lake ice that forms on the surface of bodies of water." Read More at
Wikipedia
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