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Planet Earth Wobbles As It Spins, and Now Scientists Know Why
Earth Astronomical symbol of PlanetTypically the Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 1972
Earth is the 3rd 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. Globe's gravity interacts with other items in space, especially the Sun and the Celestial satellite, Earth's only natural satellite tv. Earth revolves around sunlight in 365. 26 days and nights, a period known as an Earth year. In the course of 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 in the world. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth's positioning on its axis, and gradually slows its turn. Earth is the densest planet in the Sun System and the largest of the four terrestrial planets.
Earth's lithosphere is divided into several firm tectonic plates that move across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mostly by oceans. The rest of the 29% is land consisting of continents and islands that with each other have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are protected in ice, including 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 outer core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Inside 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 combination of Globe's distance from the Sun, 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. More than 99% of most species that ever lived on Planet are extinct. Estimates of the number of varieties in the world today vary extensively; most species have not been described. Over seven. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their your survival.[40] Humans allow us diverse societies and civilizations; politically, the world has about 200 sovereign says.
The modern English word Earth developed from a large variety of Middle The english language forms, which derived from an Old English noun most often spelled eorðe. It has cognates in most Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In their earliest appearances, eorðe was already being utilized to convert the many senses of Latin terra and Ancient greek language γῆ (gē): the ground, 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 because the mother of Thor.
Originally, world was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly if referenced along with other heavenly body. 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 acknowledges the lowercase form as the most common, with the capitalized 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. g. "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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