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Earth Astronomical symbol of EarthThe Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 72
Earth is the third planet from the sunlight and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Planet formed over 4. 5 billion years ago. Earth's gravity interacts with other things in space, especially the Sun and the Moon, Earth's only natural satellite television. Earth revolves around the Sun in 365. 26 times, a period known as an Earth year. During this time, Earth moves 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 orientation on its axis, and gradually slows its rotation. 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 29% is land including regions and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. Virtually all Earth's polar regions are included in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Globe's interior remains active with a solid iron internal core, a liquid external core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within the first billion years of Earth's history, life appeared in the oceans and began to impact 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 blend of Globe's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and flourish. In the great the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of most species that ever lived on World are extinct. Estimates of the number of species in the world today vary extensively; most species have not been described. Over seven. 6 billion humans live on Earth and rely 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 modern English word Planet developed from a large variety of Middle The english language forms, which derived from a classic English noun most often spelled eorðe. This has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In the earliest appearances, eorðe was already being utilized to translate the many senses of Latin terra and Greek γῆ (gē): the ground, their soil, dry land, your 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 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 alongside with other heavenly body. 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 recognizes the lowercase form as the most common, with the capitalized 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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