Snow and glaciers

When a snowflake falls to the ground, its fragile structure, created in the atmosphere, breaks up under pressure and recrystallises to form more compact masses, leading to the ice glacier, which is, to all intents and  purposes, a rock of ice.


Source: wikipedia

Ice is a lightweight, relatively-plastic rock that can be folded and which flows under the pressures generated by its own weight. And ice is a rock of water, and water is the main lubricant in movements of the Earth’s crust, so ice accumulated in large sheets is easily set in motion, forming glaciers.

 

Purog Kangri, the third largest glacier in the world, located in China’s Tibet.
About 560 kilometers  away from the city of Nagqu in Southwest China’s Tibet Autonomous Region.  The Purog Kangri glacier  ice field  which covers a 422- square- kilometer area, is considered to be the world's third largest glacier.

When glaciers reach the ocean they begin to float and this motion eventually breaks them into large masses of ice called icebergs. The Titanic, which sank after hitting an iceberg in 1912, is possibly the most memorable shipwreck in history.

Sometimes, it is not glaciers but the huge ice sheets or ice caps that fracture and break off to form huge fields of pack- ice of thousands of square kilometres. These usually occur in the Antarctic. However, they do not mean an immediate danger to navigation, due to the fact that winds around the Antarctic remain there around the frozen continent and do not drift the bergs toward temperate latitudes where the large transoceanic routes tend to be.

 

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