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10 Reasons We Shouldnu002639;t Leave Earth Yet Toptenz.net

Earth Astronomical symbol of PlanetThe 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 sunlight and the only astronomical thing known to harbor life. According to radiometric dating and other sources of evidence, Planet formed over 4. 5 billion years ago. Globe's gravity treats other items in space, especially the Sun and the Celestial body overhead, Earth's only natural satellite television. Earth revolves around the Sun in 365. 26 days, a period known as an Earth year. Throughout this time, Earth revolves 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 sea tides, stabilizes Earth's positioning on its axis, and slowly slows its rotation. Earth is the densest planet in the Sun System and the greatest of the four terrestrial planets.

Earth's lithosphere is divided into several inflexible tectonic plates that migrate across the surface over periods of many hundreds of thousands of years. About 71% of Earth's surface is covered with water, mostly by oceans. The 29% is land consisting of regions and islands that with each other have many lakes, waterways and other sources of water that contribute to the hydrosphere. Nearly all Earth's polar regions are covered 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 exterior core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.

Within the first billion years of Earth's history, life appeared in the oceans and began 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 mixture of Earth's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and thrive. In the great the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. More than 99% of species that ever lived on World are extinct. Estimates of the number of species on Earth today vary widely; most species have not been described. Over 7. 6 billion humans live on Earth and rely on its biosphere and natural resources for their survival.[40] Humans are suffering from diverse societies and civilizations; politically, the world has about 200 sovereign declares.

The modern English word World developed from a broad variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. This has cognates in each 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 floor, its soil, dry land, your 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, planet was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the world. By Early Modern The english language, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced alongside with other heavenly body. 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 recognizes the lowercase form as the utmost 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 forwent by the (e. g. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what on the planet are you doing? ".