There are places on Earth that are so cold that water is frozen solid. These areas of snow or ice, which are subject to temperatures below 0°C for at least part of the year, compose the cryosphere. The term “cryosphere” comes from the Greek word, “krios,” which means cold.The Cryosphere is an Imperial space station in the Music star system, which is considered to be of major strategic importance. 

With the Cryosphere (the largest human-built extrasolar space station in existence), control can be maintained over the whole system.
a) Structure: snow
The structure of snow consists of two interconnecting. phases, ice and pore space (gas), and sometimes a third phase, liquid water. 
This paper is mostly limited to methods for observing the structure of cold, dry snow.
b) Sea ice
Sea ice is a thin, fragile, solid layer that forms in the Polar Oceans.
 It forms a boundary between the relatively warm ocean and the cooler atmosphere. 
c) Frozen ground and permafrost
Frozen ground is soil or rock in which part or all of the water has frozen. 
If the ground is frozen all year long, we call it "permafrost," or permanently frozen ground. 
 The land, hardened and without any liquid water, is made up of mineral particles (particles of soil, grains and rock debris of various sizes) cemented together by ice.


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