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Planet 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 3rd planet from the Sun and the only astronomical item known to harbor life. Based on 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 tv. Earth revolves around the sunlight 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.
Globe's axis of rotation is tilted with respect to its orbital plane, producing seasons on the planet. The gravitational interaction between Earth and the Moon causes marine tides, stabilizes Earth's positioning on its axis, and gradually slows its rotation. Earth is the densest planet in the Photo voltaic System and the most significant of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many thousands of years. About 71% of Earth's surface is covered with water, mostly by oceans. The remaining 29% is land consisting of regions and islands that together have many lakes, waterways and other sources of water that contribute to the hydrosphere. Nearly 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 outer 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 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 years ago. Since then, the combination 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. Over 99% of most species that ever lived on Earth are extinct. Estimates of the number of varieties on the planet today vary broadly; most species have not been described. Over 7. 6 billion humans live on Earth and rely on its biosphere and natural resources for their your survival.[40] Humans have developed diverse societies and ethnicities; politically, the world has about 200 sovereign says.
The present day English word Planet developed from a wide variety of Middle The english language forms, which derived from a vintage 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 used to convert the many senses of Latin terra and Greek γῆ (gē): the ground, its soil, dry land, a persons 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 listed by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given because the mommy of Thor.
Originally, world was written in lowercase, and from early Center English, its definite sense as "the globe" was expressed as the world. By Early Modern British, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced together with other heavenly physiques. 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 version. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when preceded by the (e. h. "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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