Sponsorlu bağlantılar ABD'nin ingilizce tanıtımı İngilizce ABD hakkında bilgi The Americas, or America, are lands in the Western hemisphere, also known as the New World. In English, the plural form the Americas is often used to refer to the landmasses of North America and South America with their associated islands and regions while the singular form America is primarily used to refer to the United States of America. The Americas cover 8.3% of the Earth's total surface area (28.4% of its land area) and contain about 13.5% of the human population (about 900 million people). Geology South America broke off from the west of the supercontinent Gondwanaland around 135 million years ago (Ma), forming its own continent. Starting around 15 Ma, the collision of the Caribbean Plate and the Pacific Plate resulted in the emergence of a series of volcanoes along the border that created a number of islands. The gaps in the archipelago of Central America filled in with material eroded off North America and South America, plus new land created by continued volcanism. By 3 Ma, the continents of North America and South America were linked by the Isthmus of Panama, thereby forming the single landmass of the Americas.