7 Continents And 4 Oceans – Although every effort has been made to follow the rules of citation style, there may be some differences. Please refer to the appropriate style manual or other sources if you have any questions.
Despite the fact that Europa and Enceladus (Jupiter’s and Saturn’s moons, respectively) are both covered in ice, Earth is the true water world in the Solar System. About 71 percent of Earth’s surface is covered by saltwater oceans, and the continents themselves have their own lakes, rivers, and, in some cases, oceans. The largest bodies of water are the oceans, but there is some debate about the actual number of separate oceans. How many oceans does our planet have?
7 Continents And 4 Oceans
Historically, many maps and textbooks presented a four-ocean model: Pacific, Atlantic, Indian, and Arctic. The first three are the most important, while the Arctic Ocean tends to be less prominent in people’s minds. Maybe it’s because it’s much smaller than the others, occurs at the edges of the map, and tends to be covered (well, partially covered) in ice.
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In reality, however, the calculation of the Earth’s oceans depends on its perspective. A collection of scientific organizations, the International Hydrographic Organization (IHO), and many national governments note the existence of a fifth ocean, the Southern Ocean (also called Antarctica). Ocean), which consists of the waters around Antarctica below 60° S latitude, although the member states of the IHO do not agree on the formal boundaries of the ocean. Separating the Southern Ocean from the Atlantic, Pacific and Indian Oceans seems reasonable, if you consider that the Antarctic Circumpolar Current and the winds surrounding the outer approaches to the continent create a kind of natural separation, the Antarctic Convergence (according to oceanography and meteorology). ), between Antarctica and the rest of the world. In June 2021, the status of the Southern Ocean received a new boost when this body of water was officially recognized by the National Geographic Society (an American non-profit research and educational organization with a long tradition of serious mapping). Regardless of that announcement, the boundaries of the Southern Ocean were still not universally accepted.
Functionally, it is really only one sea, as each bounded sea is connected to at least two others. The reality of a single continuous ocean is also evidenced by the thermohaline circulation (also called the Global Ocean Conveyor or Great Ocean Conveyor Belt), which transports seawater through all named oceans. Thermohaline circulation continuously replaces water at depth with water from the surface and slowly replaces surface water elsewhere with water rising from deeper depths. Although every effort has been made to follow the rules of citation style, there may be some deviations. Please refer to the appropriate style manual or other sources if you have any questions.
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A continent is a large contiguous mass of land that is conventionally considered a collective region. There are seven continents: Asia, Africa, North America, South America, Antarctica, Europe and Australia (listed from largest to smallest in size). Sometimes Europe and Asia are considered one continent called Eurasia. Continents correlate loosely with the positions of tectonic plates.
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Asia is the largest continent on Earth by size. It is approximately 44,614,000 square kilometers (17,226,200 sq mi).
Geologists theorize that continents are moving. This theory is called plate tectonics, which states that the lithosphere, the outermost layer of the Earth (where there are continents), rests on a semi-fluid layer of partially molten magma called the asthenosphere. Convection from the breakdown of radioactive elements in the mantle causes continental and oceanic plates to move.
Pangea is a landmass from the Early Permian to Early Jurassic that assimilated almost all modern landmasses and is thus considered a supercontinent. Overwhelming evidence for Pangea includes similar fossil and geological records across different continents and the matching “puzzle” shapes of present-day continents, especially the eastern South American and West African coasts.
Continent, one of the larger contiguous masses of land, namely Asia, Africa, North America, South America, Antarctica, Europe, and Australia, listed in order of size. (Europe and Asia are sometimes considered a single continent, Eurasia.)
Seven Continent And Five Ocean Worksheet
There is great variation in the sizes of continents; Asia is more than five times the size of Australia. The largest island in the world, Greenland, is only about a quarter the size of Australia. The continents differ greatly in their degree of compactness. Africa has the most regular coastline and therefore the lowest ratio of coastline to total area. Europe is the most irregular and indented and has by far the highest ratio of coastline to total area.
Quiz Quick Quiz: This Country Is Your Country How much do you really know about the country you live in? Test your knowledge of continents, islands and countries in this quick quiz.
The continents are not equally distributed on the earth’s surface. If a hemispheric map centered on northwestern Europe is drawn, most of the world’s land area can be seen to lie within that hemisphere. More than two-thirds of the Earth’s land surface lies north of the equator, and all continents except Antarctica are wedge-shaped, wider in the north than they are in the south.
The distribution of the continental platforms and ocean basins on the Earth’s surface and the distribution of the most important landform features have long been among the most interesting problems for scientific research and theorizing. Among the many hypotheses that have been offered as an explanation are: (1) the tetrahedral (four-sided) theory, in which a cooling Earth assumes the shape of a tetrahedron upon spherical collapse; (2) the accretion theory, in which younger rocks attached to older shield areas were bent to form the landforms; (3) the theory of continental drift, in which an ancient floating continent drifted apart; and (4) the convection current theory, in which convection currents in the Earth’s interior pulled the Earth’s crust to cause folding and rock formation.
World Ocean Map
Geological and seismological evidence accumulated in the 20th century indicates that the continental platforms “float” on a crust of heavier material that forms a layer that completely encloses the Earth. Each continent has one of the so-called shield areas that formed 2 billion to 4 billion years ago and is the core of the continent to which the rest (most of the continent) was added. Even the rocks in the extremely old shield areas are older in the center and younger towards the edges, indicating that this accumulation process started early. In North America the whole of the northeastern quarter of the continent, called the Canadian, or Laurentian, shield, is marked by the ancient rocks of what may be called the original continent. In Europe, the shield area lies beneath the eastern Scandinavian peninsula and Finland. The Guiana Highlands of South America are the core of that continent. A large part of eastern Siberia is underlain by the old rocks, as well as western Australia and southern Africa. These halves are called hemispheres. “Hemi” means half in Greek. The Earth can be divided into northern and southern hemispheres or into eastern and western hemispheres.
The ocean is really just a large body of water. But geographers usually divide it into four seas. Atlantic, Pacific, Indian and Arctic oceans.
Put it in the class notes section of your link. Take one or two colored pencils/markers. Wait for instructions on which specific tags to add to your map.
14 World Map Activity 3: Find the United States. Within its boundaries mark the two hemispheres where it is placed. Which hemispheres are they? The Northern and Western Hemisphere. Mark these in the US on your maps.
Step 4: 7 World Continent Knowledge Kit
15 World Map Activity 4: Find Africa. Within its boundaries, mark the hemispheres where it is located. Who are they? ALL TOGETHER! Parts of Africa are in the northern, southern, eastern and western hemispheres. Mark these within Africa on your maps.
17 World Map Activity 6: Label the ocean that touches the coasts of Europe and South America. Who is it? Atlantic Ocean! Mark the Atlantic Ocean on your maps.
18 World Map Activity 7: Mark the 3 continents through which the equator passes. Who are they? South America Africa Asia Mark them on your maps.
20 World Map Activity 9: Label the ocean that touches the coasts of both Asia and South America. Who is it? Pacific Ocean! Mark the Pacific Ocean on your maps.
Continents, Lines Of Latitude And Longitude, Oceans And Ocean Currents
21 World Map Activity 10: Label the sea that lies south of Asia. Who is it? The Indian ocean! Mark the Indian Ocean on your maps.
23 World Map You should now have 7 continents and 4 oceans marked on your maps in addition to the hemispheres written in the USA and Africa. Save this map in the Class Notes section of your link! PowerPoint Created by Christine Curcuru
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