A Vast Ocean Inside the Earth: The Deep Unknown
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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 3 rd planet from the Sun and the only astronomical object known to harbor life. In accordance with radiometric dating and other sources of evidence, World formed over 4. 5 billion years ago. Globe's gravity treats other objects in space, especially the Sun and the Moon, Earth's only natural satellite tv. Earth revolves around sunlight in 365. 26 times, a period known as an Earth year. Throughout 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 marine tides, stabilizes Earth's alignment on its axis, and slowly slows its turn. Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that move across the surface over periods of many hundreds of thousands of years. About 71% of Earth's surface is covered with water, mainly by oceans. The rest of the 29% is land consisting of continents and islands that with each other have many lakes, streams and other sources of water that contribute to the hydrosphere. Nearly all Earth'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 internal core, a liquid outer 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 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 blend of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and prosper. In the good the Earth, biodiversity has long gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of species that ever lived on World are extinct. Estimates of the number of types in the world today vary extensively; most species have not been described. Over several. 6 billion humans live on Earth and depend on its biosphere and natural resources for their your survival.[40] Humans have developed diverse societies and civilizations; politically, the world has about 200 sovereign says.
The modern English word Earth developed from a large variety of Middle English forms, which derived from a classic English noun most often spelled eorðe. That has cognates in most Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already being utilized to convert the many senses of Latin terra and Ancient greek language γῆ (gē): the floor, their soil, dry land, your 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 since the mother of Thor.
Originally, world was written in lowercase, and from early Midsection 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 alongside with other heavenly body. 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 recognizes the lowercase form as the most common, with the made a fortune form an acceptable alternative. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when forwent by the (e. h. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what in the world are you doing? ".
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Happy Earth Day ~ Hudson Valley Geologist
