10 Reasons We Shouldnu002639;t Leave Earth Yet Toptenz.net
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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 1972
Earth is the third planet from the sunlight and the only astronomical object known to harbor life. Based on radiometric dating and other sources of evidence, Planet formed over 4. 5 billion years ago. Globe's gravity interacts with other things in space, especially the Sun and the Celestial body overhead, Earth's only natural satellite television. Earth revolves around the sunlight in 365. 26 days, a period known as an Earth year. During 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 steadily 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 inflexible tectonic plates that migrate across the surface over periods of many millions 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, waterways and other sources of water that contribute to the hydrosphere. The majority of Globe's polar regions are included in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Globe'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.
Inside the first billion years of Earth's history, life appeared in the oceans and started out 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 thrive. In the good the Earth, biodiversity has long gone through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of most species that ever lived on Earth are extinct. Estimates of the number of types on the planet today vary widely; 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 declares.
The present day English word World developed from a wide variety of Middle The english language forms, which derived from an Old English noun most often spelled eorðe. This has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In the earliest appearances, eorðe was already being utilized to convert the many senses of Latin terra and Ancient greek language γῆ (gē): the ground, the soil, dry land, a persons 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 mommy of Thor.
Originally, earth was written in lowercase, and from early Center English, its definite sense as "the globe" was expressed as the planet. By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced together with other heavenly bodies. 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 most common, with the capitalized 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. 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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