Glaciers

Glaciers

   From the poles to the equator, glaciers develop wherever it is cold enough for winter snow falls to summer thaw. Layer of snow compress into glaciers follow over hundreds of thousands of year glaciers have a huge impact on the landscape around them. Rocky debris becomes embedded in glaciers, and cuts into the landscape , changing the shape of the valleys they move thourgh. This debris is then dumped on to surrounding landscape wherever the glaciers it comes to rest and melts.
How glaciers ice forms
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Glaciers ice forms gradually, when fresh snow is steadily weighed down by the accumulation of younger flakes. Eventually, this compression turns light snow into dense ice with few air bubbles. Fresh snow falls formed of delicate six-sided crystals within day flakes are broken by the weight of new snowfalls. Within a year the fragments form round, dense ‘’grains’’ steadily get smaller and more tightly packed. When the firn grains are packed together to create larger ice crystals.

Glaciated valley


  As a glacier travels through a valley it wear away at the land scape, dragging grit and drit from the ground and carring them along with it. Glaciers are not just a mass of solid ice –as well as debris, they are criss-crossed with cracks called crevasses and channels of meltwater.