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In contemporary English, North and South America are generally considered separate continents, and taken together are called the Americas in the plural. When conceived as a unitary continent, the form is generally the continent of America in the singular.
Asia and Europe are considered separate continents for historical reasons; the division between the two goes back to the early Greek geographers. In the modern sense of the term "continent", Eurasia is more readily identifiable as a "continent", and Europe has occasionally been described as a subcontinent of Eurasia. [68]
Since the 1950s, [17] however, North America and South America have generally been considered by English speakers as separate continents, and taken together are called the Americas, or more rarely America. [18] [19] [3] When conceived as a unitary continent, the form is generally the continent of America in the singular.
Northern America—the northern region of the North American continent, including Canada, the United States, Greenland, Saint-Pierre and Miquelon, and Bermuda. Latin America and the Caribbean-extending from The Bahamas and Mexico to Argentina and Chile. Central America—the countries south of Mexico and north of Colombia. The Caribbean.
North and South China were on independent continents. The Kazakhstania microcontinent had collided with Siberia. (Siberia had been a separate continent for millions of years since the breakup of Pannotia.) [36] The Variscan orogeny raised the Central Pangaean Mountains, which were comparable to the modern Himalayas in scale.
The map of North America with the Western Interior Seaway during the Campanian. The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, or the Western Interior Sea) was a large inland sea that split the continent of North America into two landmasses for 34 million years.
Footprints dating back 120 million years show where dinosaurs were able to cross between land that's now part of two different continents. Matching dinosaur footprints found more than 3,700 miles ...
This explains why the continents form high platforms surrounded by deep ocean basins. [119] [3] Some geologists restrict the term continent to portions of the crust built around stable regions called cratons. Cratons have largely been unaffected by mountain-building events since the Precambrian.