The 14 "eight-thousanders[?]", 8,000 m or higher, all in the Himalayas:
By continent:
Europe
Asia
North America
South America
Africa
Oceania
Antarctica
Mars
See also: Mountain range, List of mountain ranges, List of volcanoes
... inside the groove. (Compare with graphic below.) Since this friction force is essential for the device's operation, the groove must not be lubricated. The acceleration of ...