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Earth 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 72
Earth is the 3rd planet from the Sun and the only astronomical object known to harbor life. In accordance with radiometric dating and other sources of evidence, World formed over 4. 5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Celestial satellite, Earth's only natural satellite television. Earth revolves around the Sun in 365. 26 days, a period known as an Earth year. During 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 in the world. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth's positioning on its axis, and gradually slows its turn. Earth is the densest planet in the Sun System and the most significant of the four terrestrial planets.
Earth's lithosphere is divided into several inflexible tectonic plates that move across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, generally by oceans. The remaining 29% is land consisting of continents and islands that collectively have many lakes, streams and other sources of water that contribute to the hydrosphere. Virtually all Globe's polar regions are included in ice, like the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron inner core, a liquid external 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 began to influence the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life may have arisen as much as 4. 1 billion dollars years ago. Since then, the blend of Earth's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and flourish. In the good the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of species that ever lived on World are extinct. Estimates of the number of types on Earth today vary widely; most species have not been described. Over seven. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their survival.[40] Humans are suffering from diverse societies and civilizations; politically, the world has about 200 sovereign states.
The current English word Earth developed from a broad variety of Middle British forms, which derived from an Old English noun most often spelled eorðe. This has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already being used to translate the many senses of Latin terra and Ancient greek γῆ (gē): the ground, its soil, dry land, the human 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 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, planet was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were made a fortune, and the earth became (and often remained) the Earth, particularly when referenced alongside with other heavenly bodies. More recently, the name is sometimes simply given as Earth, by example with the names of some other planets. House styles now vary: Oxford spelling acknowledges the lowercase form as the utmost common, with the capitalized form an acceptable version. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when forwent by the (e. g. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what on the planet are you doing? ".
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