Clean Earth Versus Polluted Earth Photograph by Yali Shi
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Planet Astronomical symbol of PlanetThe particular 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 Sun and the only astronomical thing known to harbor life. Based on radiometric dating and some other sources of evidence, World formed over 4. 5 billion years ago. Globe's gravity interacts with 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 and nights, a period known as an Earth year. During this time, Earth moves about its axis about 366. 26 times.
Globe'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 sea tides, stabilizes Earth's alignment on its axis, and progressively slows its rotation. Earth is the densest planet in the Photo voltaic System and the biggest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that move across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mainly by oceans. The remaining 29% is land consisting of regions and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. Virtually all Globe's polar regions are included in ice, such as 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 began to impact 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 combination of Earth's distance from the Sunshine, physical properties, and geological history have allowed life to evolve and flourish. In the history of 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 World are extinct. Estimates of the number of varieties on Earth today vary broadly; most species have not been described. Over several. 6 billion humans live on Earth and count on its biosphere and natural resources for their survival.[40] Humans are suffering from diverse societies and cultures; politically, the world has about 200 sovereign states.
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 every Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In their earliest appearances, eorðe was already being utilized to translate the many senses of Latin terra and Greek γῆ (gē): the floor, the 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 listed by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given as the mommy of Thor.
Originally, world was written in lowercase, and from early Center English, its definite sense as "the globe" was expressed as the planet. By Early Modern British, many nouns were capitalized, 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 analogy with the names of some other planets. House styles now vary: Oxford spelling recognizes the lowercase form as the most 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 preceded by the (e. gary the gadget guy. "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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Earth PNG images free download
Earth Revolving Search Results Calendar 2015
