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World Astronomical symbol of EarthTypically the Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 1972
Earth is the 3 rd planet from sunlight and the only astronomical thing known to harbor life. According to radiometric dating and other sources of evidence, World formed over 4. 5 billion years ago. Globe's gravity interacts with other objects in space, especially the Sun and the Moon, Earth's only natural satellite television. Earth revolves around sunlight in 365. 26 days and nights, a period known as an Earth year. Throughout this time, Earth revolves about its axis about 366. 26 times.
Earth's axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth. The gravitational interaction between Earth and the Moon causes marine tides, stabilizes Earth's orientation on its axis, and progressively slows its rotation. Earth is the densest planet in the Solar System and the biggest of the four terrestrial planets.
Earth's lithosphere is divided into several firm tectonic plates that move across the surface over periods of many thousands of years. About 71% of Earth's surface is covered with water, mainly by oceans. The remaining 29% is land comprising continents and islands that collectively have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are protected in ice, like the Antarctic ice sheet and the sea ice of the Arctic ice pack. Globe's interior remains active with a solid iron inner core, a liquid exterior core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Inside the first billion years of Earth's history, life appeared in the seas and commenced to affect the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life could have arisen as much as 4. 1 billion years ago. Since then, the combo of Globe's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. In the great the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of all species that ever lived on Earth are extinct. Estimates of the number of varieties in the world today vary widely; most species have not been described. Over seven. 6 billion humans live on Earth and rely on its biosphere and natural resources for their success.[40] Humans have developed diverse societies and ethnicities; politically, the world has about 200 sovereign states.
The current English word World developed from a broad variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. This has cognates in most Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already used to translate the many senses of Latin terra and Ancient greek language γῆ (gē): the floor, their soil, dry land, a persons world, the surface of the world (including the sea), and the world itself. As with Terra and Gaia, Earth was a personified goddess in Germanic paganism: the Angles were listed by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given because the mother of Thor.
Originally, earth was written in lowercase, and from early Center English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly if referenced together with other heavenly physiques. More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets. House styles now vary: Oxford spelling acknowledges the lowercase form as the most common, with the capitalized form an acceptable alternative. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when forwent by the (e. gary the gadget guy. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what in the world are you doing? ".
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