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Planet Astronomical symbol of WorldThe 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 sunlight and the only astronomical thing known to harbor life. Based on radiometric dating and some other sources of evidence, Earth formed over 4. 5 billion years ago. Globe's gravity treats other objects in space, especially the Sun and the Celestial body overhead, Earth's only natural satellite. Earth revolves around sunlight in 365. 26 times, 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 ocean tides, stabilizes Earth's positioning on its axis, and steadily slows its rotation. Earth is the densest planet in the Solar System and the greatest 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 collectively have many lakes, rivers and other sources of water that contribute to the hydrosphere. Nearly all Earth'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 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 started to impact the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life might have arisen as much as 4. 1 billion dollars years ago. Since then, the combination of Earth's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and thrive. In the great the Earth, biodiversity has long gone 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 varieties in the world today vary broadly; most species have not been described. Over 7. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their your survival.[40] Humans have developed diverse societies and civilizations; politically, the world has about 200 sovereign states.
The current English word World developed from a wide variety of Middle English forms, which derived from a classic English noun most often spelled eorðe. That 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, 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 because the mommy of Thor.
Originally, planet was written in lowercase, and from early Midsection English, its definite sense as "the globe" was expressed as the earth. 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 recognizes the lowercase form as the utmost 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 earth are you doing? ".
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