The mighty muskox!
There are several important land forms and waterways in Alaska. Mt. McKinley, the Bering Strait, the Bering Sea, and that Arctic Circle are just a few.
The second one.
Every line of longitude forms a great circle.
The Arctic Ocean
The 180th meridian or antimeridian is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle.
The same life forms that inhabit it now.
A circle.
The Antarctic Circle
The ring-shaped anastomosis that forms the cerebral arterial circle is called the Circle of Willis. It is located at the base of the brain and helps to provide collateral circulation in case of blockages in the cerebral arteries.
If it is a sector of a circle then the arc is the curved part of the circle which forms a boundary of the sector.
If you are asking about the North Pole, it is because it can be found on the Arctic Ice Sheet which forms on top of the Arctic Ocean.
Coal forms mostly in tropical or temperate regions because it requires abundant plant growth and slow burial to undergo the necessary transformation into coal. The Arctic region has a colder climate and limited plant growth, making it unsuitable for coal formation.