Earth globe spinning and rotating in a 360u00b0 loop animation. Realistic sun light. Clip contains
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Planet Astronomical symbol of EarthThe particular Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 72
Earth is the 3 rd 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 things in space, especially the Sun and the Moon, Earth's only natural satellite television. Earth revolves around the sunlight in 365. 26 days and nights, 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 the planet. The gravitational interaction between Earth and the Moon causes marine tides, stabilizes Earth's alignment on its axis, and steadily slows its rotation. Earth is the densest planet in the Sun System and the biggest 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, mostly by oceans. The remaining 29% is land including regions and islands that collectively have many lakes, streams and other sources of water that contribute to the hydrosphere. Nearly all Globe's polar regions are covered in ice, like the Antarctic ice sheet and the sea ice of the Arctic ice pack. Globe'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.
Within just the first billion years of Earth's history, life appeared in the oceans and started 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 Sunlight, 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 all species that ever lived on Earth are extinct. Estimates of the number of varieties on the planet today vary widely; most species have not been described. Over several. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their success.[40] Humans allow us diverse societies and civilizations; politically, the world has about 200 sovereign declares.
The current English word Planet developed from a large variety of Middle British forms, which derived from an Old English noun most often spelled eorðe. That has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already used to convert the many senses of Latin terra and Ancient greek language γῆ (gē): the floor, their 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 posted by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given since the mom of Thor.
Originally, world 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 when referenced along with other heavenly physiques. More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets. House styles now vary: Oxford spelling acknowledges the lowercase form as the utmost common, with the capitalized form an acceptable alternative. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when forwent 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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