Which continent has the highest average elevation?

To geographers "elevation" means a distance above sea level. If we take the average elevation of each of the continents in the question we have, in approximate figures:

Antarctica, 2,500 metres (8,200 feet)

Asia, 950 metres (3,120 feet)

Africa, 600 metres (2,000 feet)

Australia, 330 metres (1080 feet)

What makes Antarctica stand out so strikingly? The Antarctic continent is a land mass covered with ice up to four kilometres (about thirteen thousand feet) thick. There is little exposed rock and, although millions of years ago there was heavy vegetation, today the only plants that grow are very small mosses and lichens. The height of the South Pole is 2,830 metres (9,285 feet) and the highest mountain in Antarctica is Vinson Massif at 4,897 metres (16,066 feet).

Antarctica is the highest, driest, windiest and coldest continent in the world.