continēns

Continēns comes from the Latin verb continēre (to hold together, to contain), from con- (together) and tenēre (to hold). Terra continēns meant 'continuous land' — land that held together, as opposed to islands. The Greeks had a similar concept: ēpeiros meant mainland, the land you could walk to without crossing water. But neither the Greeks nor the Romans had a fixed number of continents. They knew Europe, Asia, and Libya (Africa). Whether these were three continents or one continuous landmass was debated.

The 'discovery' of the Americas in the late fifteenth century forced the addition of a fourth continent. Martin Waldseemuller's 1507 map was the first to label the new landmass 'America,' after Amerigo Vespucci. By the seventeenth century, five continents were standard: Europe, Asia, Africa, America, and the hypothesized southern continent (Terra Australis). When Australia was mapped and separated from the imagined Antarctic continent, the count rose to six. When Antarctica was confirmed as a landmass in the 1820s, it became seven — in some counting systems.

The number of continents remains unfixed. The seven-continent model (Africa, Antarctica, Asia, Australia, Europe, North America, South America) is standard in English-speaking countries. French and Spanish systems often count six, combining North and South America. The Olympic rings represent five (excluding Antarctica). Geologically, Europe and Asia are one landmass (Eurasia), and some geologists count as few as four continents. The word continent implies a natural category. The category is a convention.

Plate tectonics revealed that continents are not permanent features. They drift, collide, split, and reassemble over hundreds of millions of years. Pangaea was one continent 300 million years ago. The seven we have now are a snapshot. The Latin word for 'holding together' names landmasses that are, on a geological timescale, breaking apart and reassembling like slow-motion puzzle pieces.