The Earth Image

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Spinning planet Earth isolated black bg textures by NASA Motion Background Storyblocks Video

World Astronomical symbol of PlanetThe 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. According to radiometric dating and some other sources of evidence, Planet formed over 4. 5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Celestial satellite, Earth's only natural satellite tv. Earth revolves around the sunlight in 365. 26 times, a period known as an Earth year. In the course of 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 on Earth. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth's positioning on its axis, and progressively slows its turn. Earth is the densest planet in the Solar System and the most significant of the four terrestrial planets.

Earth's lithosphere is divided into several rigid tectonic plates that move across the surface over periods of many hundreds of thousands of years. About 71% of Earth's surface is covered with water, mainly by oceans. The 29% is land including areas and islands that together have many lakes, streams and other sources of water that contribute to the hydrosphere. Virtually all Earth's polar regions are protected in ice, such as the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron interior 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 seas and started to influence 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 mixture of Earth's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and flourish. In the good the Earth, biodiversity has long gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of most species that ever lived on World are extinct. Estimates of the number of species on Earth today vary extensively; most species have not been described. Over several. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their your survival.[40] Humans are suffering from diverse societies and ethnicities; politically, the world has about 200 sovereign declares.

The present day English word Earth 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 the earliest appearances, eorðe was already being used to translate the many senses of Latin terra and Ancient greek γῆ (gē): the earth, its soil, dry land, the human 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 mommy of Thor.

Originally, planet was written in lowercase, and from early Midsection English, its definite sense as "the globe" was expressed as the planet. By Early Modern English, many nouns were made a fortune, and the earth became (and often remained) the Earth, particularly when referenced together 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 identifies the lowercase form as the utmost common, with the made a fortune form an acceptable alternative. 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? ".