Glaciers Facts

Glaciers Facts
Glaciers are made up of dense ice, and are formed when snow and ice compact. Glaciers are constantly moving due to their own weight, and this movement over land creates landforms over many centuries, moving very slowly. The two main types of glaciers are alpine glaciers and continental glaciers. Glaciers are classified according to their behavior, thermal characteristics and morphology, and they move as a result of both gravity and ice deforming internally. Most glaciers move at about 3 feet a day, but some are able to move at 100 feet a day under the right conditions.
Interesting Glaciers Facts:
Alpine glaciers are those that flow downward, often from mountaintops. They are much smaller than continental glaciers. When the alpine glacier reaches a valley it is often referred to as a valley glacier.
Continental glaciers are extremely vast and are not affected much by the land they pass over. They make alpine glaciers look tiny by comparison.
Temperate glaciers are usually at the melting point from the surface to the base.
A polar glacier is always at a temperature below freezing from surface to base.
A sub-polar glacier is made up of polar ice and temperate ice.
A cold-based glacier is at temperatures below freezing at ice/ground interface and frozen to the substrate below.
A warm-based glacier is at temperatures at or above freezing at interface.
Polythermal glaciers are both warm and cold based.
Lambert glacier in Antarctica is the largest glacier on earth. It is 60 miles wide and 270 miles long. It was named after Bruce P. Lambert, a mapper from Australia who, in the 1950s, helped to map the area.
A glacier must be at least .1 square kilometer in size to be classified as such. This is equal to almost 19 football fields.
As layers of snow become compressed by new layers, they take on the consistency of sugar grains. Eventually they become glacial ice.
It is estimated that there are approximately 100,000 glaciers in Alaska alone. Most do not have names.
Glaciers cover about 28,000 square miles of Alaska.
People in Alaska are able to harvest glacial ice if they obtain the correct permit.
The sea levels around the world would rise by more than 260 feet if every single ice sheet and glacier on earth were to melt.
The Jakobshavn Glacier in Greenland set a new record in 2012 by travelling at speeds of 150 feet a day.
During the last ice age, one third of the earth's ground was covered at one point by glaciers.
Every continent except for Australia has glaciers. Mexico and even the Andes in Ecuador have glaciers.
When glaciers grind bedrock it creates a fine powder that is able to be suspended in water. This can create the turquoise blue color of some lakes.
Because blue light is able to penetrate ice and snow, glaciers can appear blue.
Today 10% of earth's land is covered by glaciers.
It is estimated that 75% of the world's fresh water supply is held in glaciers.

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