At different times, the number of countries (called Union republics) that were part of the Union of Soviet Socialist Republics (USSR) varied.
At the time of the collapse of the USSR in 1991 there were 15 Union republics:
Russian Soviet Federal socialist Republic (RSFSR) Continue reading
Greenland is the largest island on the planet, located in the North Atlantic ocean, just 740 kilometers from the North pole.
The huge (2.2 million square km) area of the island is 80% covered with ice. This is the famous Greenland ice sheet, which in places reaches a thickness of three kilometers. Continue reading