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Earth Astronomical symbol of PlanetThe 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 the sunlight and the only astronomical object known to harbor life. According to radiometric dating and some other sources of evidence, Planet formed over 4. 5 billion years ago. Globe's gravity interacts with other items in space, especially the Sun and the Celestial satellite, Earth's only natural satellite television. Earth revolves around the sunlight in 365. 26 days, a period known as an Earth year. Throughout this time, Earth moves about its axis about 366. 26 times.
Globe's axis of rotation is tilted with respect to its orbital plane, producing seasons in the world. The gravitational interaction between Earth and the Moon causes sea tides, stabilizes Earth's positioning on its axis, and gradually slows its rotator. Earth is the densest planet in the Solar System and the biggest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mostly by oceans. The rest of the 29% is land comprising continents and islands that together have many lakes, waterways and other sources of water that contribute to the hydrosphere. Nearly all Earth's polar regions are protected in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron internal core, a liquid outer 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 oceans and commenced to influence 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 dollars years ago. Since then, the blend of Earth's distance from the Sunshine, physical properties, and geological history have allowed life to evolve and flourish. In the history of the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of most species that ever lived on World are extinct. Estimates of the number of types on Earth today vary broadly; most species have not been described. Over several. 6 billion humans live on Earth and depend on its biosphere and natural resources for their success.[40] Humans are suffering from diverse societies and civilizations; politically, the world has about 200 sovereign says.
The present day English word World developed from a wide variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. It has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In their earliest appearances, eorðe was already being utilized to translate the many senses of Latin terra and Greek γῆ (gē): the floor, the soil, dry land, the human world, the surface of the world (including the sea), and the globe itself. As with Terra and Gaia, Earth was a personified goddess in Germanic paganism: the Angles were posted by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given since the mommy of Thor.
Originally, earth was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the world. By Early Modern English, many nouns were made a fortune, and the earth became (and often remained) the Earth, particularly when referenced along with other heavenly bodies. 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 made a fortune form an acceptable variant. 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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