A crevass, I believe.
its acracked knee cap
Crevasse not to be confused with crevice
Cracks in any ice cap are called crevasses, and because they are subject to shifting and re-shaping, they are not generally named.Antarctica is covered in an ice sheet, and eruptions in that sheet are called nunataks -- mountain tops. Again, any crack in the ice sheet would be a crevasse and would exist without a name.
It is called a "lead", or "polynya"
A Glacier an ice sheet an ice cap
A warm period. But have a crack at "interglacial" in wikipedia.
Ice Wedging Or Frost Wedging
a spring whose water flows from a crack in the cap rock over the aquifer
The ice in Antarctica does crack forming crevasses. This is common in all ice formations.
No, ice cap is a common noun. It is only a proper noun if it is the name of something specific, such as Ice Cap, Alaska or Ice Cap Products.
Cap Polar ice cap Mountain ice cap
The only thing I can get from that question is that there is a hairline crack in the cap.