- What is a continent?
- How many continents are there?
- Africa
- America
- Asia
- Europe
- Oceania
- Antarctica
- Continents and oceans
We explain what a continent is and how many continents there are. Also, some of its characteristics and what the oceans are.
What is a continent?
When we speak of the continents we refer to the great expanses of the Earth crust that have emerged from the oceans, and that considerably exceeds in size even the largest of the islands.
The word continent comes from the Latin continent, derived from terra continents or "continuous lands". But the criterion to define what a continent is or is not is of a historical and cultural nature, which is why it has varied throughout the weather, as well as have varied, although throughout the millennia of the geological history of the planet, the location of the continents and the distance that separates them. In fact, in prehistoric times all the continents made up various supercontinents, known as Pangea, Pannotia, etc.
From a geographical point of view, the continents are the great land organizations of the world, in which the islands that are more or less close to their coasts have a place.
The continents were formed from the cooling of the earth's crust, and are composed mainly of granite and associated rocks, unlike the oceanic crust, where basalt and gabbro predominate. Its initial appearance seems, as suggested by its current forms, to have occurred in a very different way, since over the millennia the Continental drift has moved them, separated, reunited and moved them successively, modifying both the weather as the visible appearance of the planet's surface.
How many continents are there?
There is no single way to list the continents, as each continental model offers its own view on the matter. Thus, there are models that identify 4, 5, 6 and 7 continents, the latter being the most recognized in English-speaking countries (Africa, Antarctica, South America, Asia, Europe, North America and Oceania); while in other regions the number 6 is used (unifying America); and in specific areas of the geology the one of 5 is accepted, more similar to the tectonic plates (uniting Europe and Asia on the same continent, Eurasia).
In recent times, the theory was proposed that there is an additional continent called Zealandia, which would have submerged in the waters of the Pacific Ocean millennia ago.
Africa
The “black continent”, as it is nicknamed because of the racial predominance of its population, is the original continent of the humanity, where Homo sapiens first saw the world. This continent is joined to Asia by the Isthmus of Suez and separated from Europe by the Strait of Gibraltar and the Mediterranean Sea. Its oceanic limits are: the Atlantic to the west and the Indian Ocean to the east. It has a total area of 30,272,922 km2 (20.4% of the world's emerged lands) on which 15% of the world's population lives, about one billion inhabitants, spread over 54 countries.
America
Traditionally separated into three geographical regions: North, Central and South America, and made up of 35 countries, this continent is nicknamed the "new", because its existence was known in Asia and Europe only in the 15th century, millennia after it was populated from Asia by primitive humanity. Geographically, America It borders the Arctic Ocean in the north, is separated from Antarctica by the Drake Passage in the south, and is surrounded by the Atlantic and Pacific oceans in the east and west respectively. The second largest land mass on the globe, it has a total area of 43,316,000 km2 (equivalent to 30.2% of the emerged surface) on which about 12% of humanity lives.
Asia
The largest and most populated continent in the world, with an area of almost 45 million km2 (more than 30% of the emerged surface) and a population of 4 billion inhabitants (69% of the world population) spread over 49 countries, It is located in the eastern half of the Northern Hemisphere, bordered to the north by the Glacial Arctic Ocean, the Indian Ocean to the south, and to the east by the Pacific Ocean. Although geographically it is a separate continent, it forms a single land mass with Europe, and once formed the Supercontinent of Eurasia with it. Asia is separated from Africa by the Suez Isthmus and encompasses a huge number of islands between the Pacific and Indian Oceans.
Europe
United to Asia in the same continental mass, but geographically located in the north-central part of the Northern Hemisphere, is the European continent, with its 10,530,751 km2 of total surface (6.8% of the landmass) and its population of 743,704 .000 inhabitants (barely 11% of the world's population) spread over 50 countries. Europe It is bordered to the south by the Mediterranean Sea, to the west by the Atlantic Ocean, to the east by Asia and the Middle East, and to the north by the Baltic Sea and the Arctic Ocean. Despite its small dimensions, Europe has played an important role in the destiny of humanity since classical times of Antiquity, especially as a result of its doctrines imperial from the 15th to the 19th centuries.
Oceania
This island continent, located in the southeastern region of the Southern Hemisphere, is the smallest of all, with just 9,008,458 km2. However, it is home to some 40,117,432 inhabitants, spread over 15 countries, between the continental shelf (Australia) and its smaller islands in the Pacific (New Zealand, New Guinea, Micronesia, Melanesia and Polynesia). Its limits are with the Indian Ocean to the west, the Pacific to the east, the Antarctic to the south, and the islands of South Asia to the north.
Antarctica
The southernmost continent on the planet, located almost at the south pole, is a land mass of 14,000,000 km2 of which only 280,000 km2 are discovered of ice during the summer. It is, therefore, the coldest, driest and windiest continent in the world, as well as the highest of all. For that reason, it was the last continent to be discovered and colonized by humanity, and it lacks its own population, barely being visited by scientists, soldiers and specialists who do not exceed 5,000 people, spread over 60 bases belonging to 30 different countries.
Continents and oceans
Contrary to the emerged continents, the oceanic surface is the portion of the earth's crust that is under seawater, forming in its greatest extensions what we know as oceans: the great extensions of Water salty that separate the continents from each other, covering 71% of the planet. In the world we recognize five different oceans:
- Atlantic Ocean. Separating America and Europe to the north and America and Africa to the south, it has a length maximum of 14,700 km (N-S) and houses a volume of water of 354,700,000 km3.
- Indian Ocean. Located south of the Indian subcontinent, between Asia, Africa and Oceania, it has a maximum width of 10,000 km and houses a volume of water of about 292,131,000 km3.
- Pacific Ocean. The largest of all oceans, it is found separating America from Asia to the north or America and Oceania to the south. Its surface reaches 155,557 km2 and its maximum length is 15,000 km. It contains about 714,839,310 km3 of water.
- Arctic Ocean. As its name implies, it is located in the region circumpolar north, and is the smallest ocean on the planet. Its area is barely 14,056,000 km2 and it separates the north of North America from Asia and Europe.
- Antartic Ocean. Located around the continental coast of Antarctica, it is the southernmost ocean on the planet and has a surface area of 20,327,000 km2, bordering the southern part of the Pacific and Indian Oceans.