Forget Earth Hour! What Earth Needs Is A Planetary Holiday TDA Global Cycling
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Planet Astronomical symbol of WorldThe 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 some other sources of evidence, World formed over 4. 5 billion years ago. Earth's gravity treats other items in space, especially the Sun and the Celestial satellite, Earth's only natural satellite. Earth revolves around sunlight in 365. 26 days, 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 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 rotator. Earth is the densest planet in the Sun System and the greatest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many thousands of years. About 71% of Earth's surface is covered with water, mostly by oceans. The remaining 29% is land consisting of regions and islands that with each other have many lakes, streams and other sources of water that contribute to the hydrosphere. The majority of Globe's polar regions are protected 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 internal core, a liquid external 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 commenced 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 Globe's distance from the Sunlight, physical properties, and geological history have allowed life to evolve and flourish. In the good the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. More than 99% of most species that ever lived on Earth are extinct. Estimates of the number of types on the planet today vary broadly; most species have not been described. Over 7. 6 billion humans live on Earth and count on its biosphere and natural resources for their success.[40] Humans have developed diverse societies and ethnicities; politically, the world has about 200 sovereign declares.
The current English word World developed from a wide variety of Middle British forms, which derived from a classic English noun most often spelled eorðe. It has cognates in each 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 Greek γῆ (gē): the ground, the soil, dry land, the human 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 because the mom 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 if 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 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 forwent 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 the planet are you doing? ".
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