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File:Earth Eastern Hemisphere.jpg Wikimedia Commons
Earth Astronomical symbol of WorldThe particular 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 other sources of evidence, Earth formed over 4. 5 billion years ago. Earth's gravity treats other objects in space, especially the Sun and the Celestial satellite, Earth's only natural satellite tv. Earth revolves around the Sun in 365. 26 days and nights, a period known as an Earth year. Throughout this time, Earth rotates 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 sea tides, stabilizes Earth's orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Photo voltaic System and the largest of the four terrestrial planets.
Earth's lithosphere is divided into several inflexible tectonic plates that migrate across the surface over periods of many thousands of years. About 71% of Earth's surface is covered with water, generally by oceans. The remaining 29% is land including areas and islands that collectively have many lakes, waterways and other sources of water that contribute to the hydrosphere. Virtually all Globe's polar regions are covered 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 exterior core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within just the first billion years of Earth's history, life appeared in the seas and started out to affect 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 Globe's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. In the good the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. More than 99% of most species that ever lived on Planet are extinct. Estimates of the number of types on Earth today vary extensively; most species have not been described. Over seven. 6 billion humans live on Earth and count on its biosphere and natural resources for their survival.[40] Humans allow us diverse societies and ethnicities; politically, the world has about 200 sovereign says.
The present day English word World developed from a wide variety of Middle British forms, which derived from a classic English noun most often spelled eorðe. It has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its 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, your 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 as the mother of Thor.
Originally, earth was written in lowercase, and from early Midsection English, its definite sense as "the globe" was expressed as the planet. By Early Modern The english language, many nouns were made a fortune, and the earth became (and often remained) the Earth, particularly if referenced along with other heavenly bodies. More recently, the name is sometimes simply given as Earth, by analogy with the names of some other planets. House styles now vary: Oxford spelling identifies 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 preceded by the (e. gary the gadget guy. "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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