There are seven continents on Earth: Africa, Antarctica, Asia, Europe, North America, Australia, and South America. This classification is based on geographical and cultural distinctions, as well as tectonic plate boundaries. Each continent varies significantly in size, habitat, population, and biodiversity. For example, Asia is the largest and most populous continent, while Antarctica is the least populated and is primarily covered by ice. The concept of continents can vary slightly in different contexts; for instance, some models combine Europe and Asia into a single landmass called Eurasia. Nevertheless, the seven-continent model is widely accepted.