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In geology, a continent is defined as "one of Earth's major landmasses, including both dry land and continental shelves". The geological continents correspond to seven large areas of continental crust that are found on the tectonic plates , but exclude small continental fragments such as Madagascar that are generally referred to as microcontinents.
The name "Pangaea" is derived from Ancient Greek pan ( πᾶν, "all, entire, whole") and Gaia or Gaea ( Γαῖα, " Mother Earth, land"). [4] [9] The first to suggest that the continents were once joined and later separated may have been Abraham Ortelius in 1596. [10] The concept that the continents once formed a contiguous land mass was ...
The four parts of the world [2] or the four corners of the world refers to Africa (the "south"), the Americas (the "west"), Asia (the "east"), and Europe (the "north"). Depictions of personifications of the four continents became popular in several media. Sets of four could be placed around all sorts of four-sided objects, or in pairs along the ...
Earthrise, taken on December 24, 1968, by Apollo 8 astronaut William Anders. Earthrise is a photograph of Earth and part of the Moon 's surface that was taken from lunar orbit by astronaut William Anders on December 24, 1968, during the Apollo 8 mission. [1] [2] [3] Nature photographer Galen Rowell described it as "the most influential ...
The Blue Marble, taken by either Ron Evans or Harrison Schmitt of the Apollo 17 crew in 1972. The original photograph was taken with the South Pole facing the top, however this version is the most widely distributed. The Blue Marble is a photograph of Earth taken on December 7, 1972, from a distance of around 29,400 kilometers (18,300 miles ...
World map. A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth.
Earth's average orbital distance is about 150 million km (93 million mi), which is the basis for the astronomical unit (AU) and is equal to roughly 8.3 light minutes or 380 times Earth's distance to the Moon. Earth orbits the Sun every 365.2564 mean solar days, or one sidereal year. With an apparent movement of the Sun in Earth's sky at a rate ...
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]
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