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A supercontinent cycle is the break-up of one supercontinent and the development of another, which takes place on a global scale. [4] Supercontinent cycles are not the same as the Wilson cycle, which is the opening and closing of an individual oceanic basin. The Wilson cycle rarely synchronizes with the timing of a supercontinent cycle. [1]
Eurasia (/ j ʊəˈr eɪ ʒ ə / yoor-AY-zhə, also UK: /-ʃ ə /-shə) is the largest continental area on Earth, comprising all of Europe and Asia. [3] [4] According to some geographers, physiographically, Eurasia is a single supercontinent. [4]
Extrapolating the concept to its extreme, some geographers group the Australian continental landmass with other islands in the Pacific Ocean into Oceania, which is usually considered a region rather than a continent. This divides the entire land surface of Earth into continents, regions, or quasi-continents.
Afro-Eurasia (also Afroeurasia and Eurafrasia) is a landmass comprising the continents of Africa, Europe, and Asia. [ 1 ] [ 2 ] The terms are compound words of the names of its constituent parts. Afro-Eurasia has also been called the " Old World ", in contrast to the " New World " referring to the Americas .
Over a hundred of the 224 drugs mentioned in the Huangdi Neijing – an early Chinese medical text – are herbs. [11] Herbs also commonly featured in the medicine of ancient India, where the principal treatment for diseases was diet. [12] A sample of raw opium. Opioids are among the world's oldest known drugs.
A lack of international leadership, President-elect Donald Trump's second term and AI all made the list of the biggest risks the world faces in 2025, according to the Eurasia Group, which is a ...
between Africa and Asia (dividing Afro-Eurasia into Africa and Eurasia): at the Isthmus of Suez; between Asia and Europe (dividing Eurasia): along the Turkish straits, the Caucasus, and the Urals and the Ural River (historically also north of the Caucasus, along the Kuma–Manych Depression or along the Don River);
Eurasia Group Director of Global Strategic Analysis Caitlin Dean discusses the reasons why the U.S. depends on foreign healthcare supplies.