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Happy Earth Day ~ Hudson Valley Geologist
Earth 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 72
Earth is the 3rd planet from sunlight and the only astronomical object known to harbor life. Based on radiometric dating and some other sources of evidence, Earth formed over 4. 5 billion years ago. Earth's gravity treats other items in space, especially the Sun and the Celestial body overhead, Earth's only natural satellite tv. Earth revolves around the Sun in 365. 26 times, 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 on Earth. The gravitational interaction between Earth and the Moon causes sea tides, stabilizes Earth's positioning on its axis, and progressively slows its rotator. Earth is the densest planet in the Sun System and the largest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mainly by oceans. The rest of the 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. Virtually all Globe's polar regions are covered in ice, such as 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 external core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within just the first billion years of Earth's history, life appeared in the seas and started out to impact 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 years ago. Since then, the blend of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. In the good the Earth, biodiversity has eliminated through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of species that ever lived on Earth are extinct. Estimates of the number of species 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 your survival.[40] Humans are suffering from diverse societies and ethnicities; politically, the world has about 200 sovereign declares.
The current English word Planet developed from a large variety of Middle English forms, which derived from a classic 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 used to convert the many senses of Latin terra and Ancient greek γῆ (gē): the earth, 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 listed by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given because the mother of Thor.
Originally, planet was written in lowercase, and from early Midsection 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 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 utmost common, with the made a fortune 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 the planet are you doing? ".
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