Landmasses are large continuous areas of land, which include continents and islands. They play a crucial role in Earth's geography, influencing climate, ecosystems, and human activities. The seven major continents—Asia, Africa, North America, South America, Antarctica, Europe, and Australia—are the most significant landmasses on our planet. Islands, which are smaller landmasses surrounded by water, can vary greatly in size and biodiversity. Some, like Greenland, are quite large, while others, like Bikini Atoll, are much smaller. Together, these landmasses shape the Earth's surface and provide habitats for countless species.