The index was developed by the Center for, Environmental law and Policy at Yale University and the, Il s'agit d'un indice qui a été élaboré par le Center for Environmental Law and, The Ramsar Data Gateway project, under development within a. USA, in cooperation with Wetlands International and the Ramsar Bureau, is intended to provide Web-based access to Ramsar sites data for the public. The surface area of Earth is about 197 million square miles / 510 million square kilometers. [192], The atmospheric pressure at Earth's sea level averages 101.325 kPa (14.696 psi),[193] with a scale height of about 8.5 km (5.3 mi). Earth has lots of spacecraft watching it. [8] There are also inoperative satellites, including Vanguard 1, the oldest satellite currently in orbit, and over 16,000 pieces of tracked space debris. [35], The oldest material found in the Solar System is dated to 4.5682+0.0002−0.0004 Ga (billion years) ago. The greatest dad in the animal world . By 2050, 68% of the world's population is expected to be living in urban, rather than rural, areas. Trending Posts. Actually, Earth Day is one of two days, depending on when you choose to observe it. [48], As the molten outer layer of Earth cooled it formed the first solid crust, which is thought to have been mafic in composition. PLANET EARTH â OUR PLANET. How on earth can we implement a framework if we do not have the people on the ground who have the capacity to execute them? The crust is separated from the mantle by the Mohorovičić discontinuity. Fifty years ago, we finally saw it", "Apollo 8's Earthrise: The Shot Seen Round the World – Half a century ago today, a photograph from the moon helped humans rediscover Earth", "We Are All Riders on the Same Planet – Seen from space 50 years ago, Earth appeared as a gift to preserve and cherish. [105] The radius of the inner core is about one fifth of that of Earth. www2.parl.gc.ca. Mars is the fourth planet from the Sun in the Solar System and the second smallest planet. Image Credit: NASA. [266] Lord Kelvin used thermodynamics to estimate the age of Earth to be between 20 million and 400 million years in 1864, sparking a vigorous debate on the subject; it was only when radioactivity and radioactive dating were discovered in the late 19th and early 20th centuries that a reliable mechanism for determining Earth's age was established, proving the planet to be billions of years old.[267][268]. Scientists are hoping for a treasure trove of information about the solar system and life on Earth ⦠The most recent reversal occurred approximately 700,000 years ago. ", Interactive 3D visualisation of the Sun, Earth and Moon system, https://en.wikipedia.org/w/index.php?title=Earth&oldid=994638743, Astronomical objects known since antiquity, Planets in the circumstellar habitable zone, Wikipedia indefinitely semi-protected pages, All Wikipedia articles written in American English, Articles containing potentially dated statements from April 2020, All articles containing potentially dated statements, Articles containing potentially dated statements from November 2018, Wikipedia articles with TDVİA identifiers, Wikipedia articles with WORLDCATID identifiers, Creative Commons Attribution-ShareAlike License. 1 Earth, the Earth [uncountable, singular] the world; the planet that we live on the planet Earth the history of life on earth the earth's ozone layer The earth revolves around the sun. The Apollo missions gave people their first look at Earth as a round world, not a flat one. [112] More of the heat in Earth is lost through plate tectonics, by mantle upwelling associated with mid-ocean ridges. [25] It has cognates in every Germanic language, and their ancestral root has been reconstructed as *erþō. The ozone layer blocks ultraviolet solar radiation, permitting life on land. Twórz wycieczki i mapy. de statistiques sur son site Internet ayant trait à la Répartition mondiale de la pauvreté (http://sedac.ciesin.columbia.edu/povmap). Could another one start? That 0.25 extra means every four years we need to add one day to our calendar. Photosynthesis provided a source of free oxygen, but the loss of reducing agents such as hydrogen is thought to have been a necessary precondition for the widespread accumulation of oxygen in the atmosphere. [198], Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. [196] This last phenomenon is known as the greenhouse effect: trace molecules within the atmosphere serve to capture thermal energy emitted from the ground, thereby raising the average temperature. It is composed mostly of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminum (1.4%), with the remaining 1.2% consisting of trace amounts of other elements. Water vapor, carbon dioxide, methane, nitrous oxide, and ozone are the primary greenhouse gases in the atmosphere. In the history of life on Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinctions. It completes a spin around itself in 17 hours and 14 minutes. How to use earth in a sentence. This page has a vast collection of Earth example sentences. Earth is the densest planet in the Solar System and the largest and most massive of the four rocky planets. According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago. [244], Earth has resources that have been exploited by humans. [233] 68% of the land mass of the world is in the Northern Hemisphere. States claim the planet's entire land surface, except for parts of Antarctica and a few other unclaimed areas. The oldest oceanic crust is located in the Western Pacific and is estimated to be 200 Ma old. We call it a leap day (in a leap year). [59], Chemical reactions led to the first self-replicating molecules about four billion years ago. 50 Interesting Facts About Earth. [201], The amount of solar energy reaching Earth's surface decreases with increasing latitude. When it comes to writing, this common English word confuses many native speakers who arenât sure whether to use Earth or earth. [213], Thermal energy causes some of the molecules at the outer edge of the atmosphere to increase their velocity to the point where they can escape from Earth's gravity. The water is 3% fresh and 97% salted. More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets, though earth and forms with the remain common. [166] The same effect on the Moon has led to its tidal locking: its rotation period is the same as the time it takes to orbit Earth. Some people celebrate Earth Day on the first day of Spring, which is the vernal equinox that occurs on or around March 21st. [44] Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanets, and comets. Without this tilt, there would be an eclipse every two weeks, alternating between lunar eclipses and solar eclipses. the earth definition in English dictionary, the earth meaning, synonyms, see also 'cost the earth',Friends of the Earth',salt of the earth',alkaline earth'. The fastest-moving plates are the oceanic plates, with the Cocos Plate advancing at a rate of 75 mm/a (3.0 in/year)[120] and the Pacific Plate moving 52–69 mm/a (2.0–2.7 in/year). [243] The farthest that humans have traveled from Earth is 400,171 km (248,655 mi), achieved during the Apollo 13 mission in 1970. Trending. (n.) noun. Earth's hydrosphere consists chiefly of the oceans, but technically includes all water surfaces in the world, including inland seas, lakes, rivers, and underground waters down to a depth of 2,000 m (6,600 ft). [245] Humans use building materials to construct shelters. [54], New continental crust forms as a result of plate tectonics, a process ultimately driven by the continuous loss of heat from Earth's interior. [224], Extreme weather, such as tropical cyclones (including hurricanes and typhoons), occurs over most of Earth's surface and has a large impact on life in those areas. [155] Above the Arctic Circle and below the Antarctic Circle there is no daylight at all for part of the year, causing a polar night, and this night extends for several months at the poles themselves. In addition to an annual component to this motion, there is a 14-month cycle called the Chandler wobble. Earth – Videos – International Space Station: This page was last edited on 16 December 2020, at 19:25. [187], The average salinity of Earth's oceans is about 35 grams of salt per kilogram of sea water (3.5% salt). Density increases with depth, as described in the table on the right. The year length of Venus is 225 Earth days. It is a terrestrial planet because it has a solid, rocky surface like other planets in the inner solar system. It is the largest moon in the Solar System relative to the size of its planet, although Charon is larger relative to the dwarf planet Pluto. The mass of the oceans is approximately 1.35×1018 metric tons or about 1/4400 of Earth's total mass. This rule is still followed in German writing today. About 74% of the surface of Earth is covered by liquid or frozen water. en série, cartes et photos en sciences de la Terre sous format papier et électronique. Enrich your vocabulary with the English … The crust and the cold, rigid, top of the upper mantle are collectively known as the lithosphere, which is divided into independently moving tectonic plates.[103]. [249] Mineral ore bodies have also been formed within the crust through a process of ore genesis, resulting from actions of magmatism, erosion, and plate tectonics. Local topography deviates from this idealized spheroid, although on a global scale these deviations are small compared to Earth's radius: the maximum deviation of only 0.17% is at the Mariana Trench (10,925 metres or 35,843 feet below local sea level),[92] whereas Mount Everest (8,848 metres or 29,029 feet above local sea level) represents a deviation of 0.14%. The Western alchemists called this Adam's Earth; in Greek mythology it is the lower side of Rhea. This gives an apparent movement of the Sun eastward with respect to the stars at a rate of about 1°/day, which is one apparent Sun or Moon diameter every 12 hours. www2.parl.gc.ca. See: Due to natural fluctuations, ambiguities surrounding, The ultimate source of these figures, uses the term "seconds of UT1" instead of "seconds of mean solar time".—. Its name comes from the the old English and Germanic words meaning âthe groundâ. [26], Historically, earth has been written in lowercase. Beyond these, the exosphere thins out into the magnetosphere, where the geomagnetic fields interact with the solar wind. [241][242] Normally, the only humans in space are those on the International Space Station. Earth is the third planet from the Sun and the only astronomical object known to harbor life. (Table 8o-1)", "The IAU 2009 system of astronomical constants: The report of the IAU working group on numerical standards for Fundamental Astronomy", "Global average temperature may hit record level in 2010", "Trends in Atmospheric Carbon Dioxide: Recent Global, National Oceanic and Atmospheric Administration, "The age of the Earth in the twentieth century: a problem (mostly) solved", "Ag Isotopic Evolution of the Mantle During Accretion: New Constraints from Pd and Ag Metal-Silicate Partitioning", "Constraining the Evolutionary History of the Moon and the Inner Solar System: A Case for New Returned Lunar Samples", "Controversial Moon Origin Theory Rewrites History", "On the origin and composition of Theia: Constraints from new models of the Giant Impact", "Earth's water may have been inherited from material similar to enstatite chondrite meteorites", "Oldest measurement of Earth's magnetic field reveals battle between Sun and Earth for our atmosphere", "Heterogeneous Hadean hafnium: evidence of continental crust at 4.4 to 4.5 ga", "Early formation and long-term stability of continents resulting from decompression melting in a convecting mantle", "Rates of generation and destruction of the continental crust: implications for continental growth", "Secular Trends in the Geologic Record and the Supercontinent Cycle", "When and how did the ice age end? Comment diable pouvons-nous mettre en oeuvre un cadre de travail sans des responsables sur place ayant la capacité de les mettre en oeuvre? Planet Earth : Facts and Information. At the same time, the upwelling of mantle material at divergent boundaries creates mid-ocean ridges. [227] There is a scientific consensus that humans are causing global warming by releasing greenhouse gases into the atmosphere. Without this heat-retention effect, the average surface temperature would be −18 °C (0 °F), in contrast to the current +15 °C (59 °F),[197] and life on Earth probably would not exist in its current form. The land surface of the world. [183][184] Most fresh water, about 68.7%, is present as ice in ice caps and glaciers. [203], Further factors that affect a location's climates are its proximity to oceans, the oceanic and atmospheric circulation, and topology. Creating artificial distinctions as here with the word âEarthâ, vs. âthe earthâ is nonsensical and does not follow historic usage. [5] A dry atmosphere is composed of 78.084% nitrogen, 20.946% oxygen, 0.934% argon, and trace amounts of carbon dioxide and other gaseous molecules. 70% of our planet is covered with oceans. Over 99% of all species that ever lived on Earth are extinct. Earth definition is - the fragmental material composing part of the surface of the globe; especially : cultivable soil. [134] The convection movements in the core are chaotic; the magnetic poles drift and periodically change alignment. [106] At the center, the temperature may be up to 6,000 °C (10,830 °F),[107] and the pressure could reach 360 GPa (52 million psi). Third planet from the Sun in the Solar System, This article is about the planet. [209] Surface air temperature can rise to around 55 °C (131 °F) in hot deserts, such as Death Valley, and can fall as low as −89 °C (−128 °F) in Antarctica. For bodies near the celestial equator, this is equivalent to an apparent diameter of the Sun or the Moon every two minutes; from Earth's surface, the apparent sizes of the Sun and the Moon are approximately the same. [133], The main part of Earth's magnetic field is generated in the core, the site of a dynamo process that converts the kinetic energy of thermally and compositionally driven convection into electrical and magnetic field energy. [234] Partly due to the predominance of land mass, 90% of humans live in the Northern Hemisphere. In many cultures it is a mother goddess that is also the primary fertility deity. [72][73] Apart from the proposed current Holocene extinction event, the most recent was 66 Ma, when an asteroid impact triggered the extinction of the non-avian dinosaurs and other large reptiles, but largely spared small animals such as insects, mammals, lizards and birds. The capsule from the Japanese space probe has landed in the Australian desert. Venus is the second planet from the sun. Paleontological evidence and computer simulations show that Earth's axial tilt is stabilized by tidal interactions with the Moon. [185], In Earth's coldest regions, snow survives over the summer and changes into ice. In the Northern Hemisphere, winter solstice currently occurs around 21 December; summer solstice is near 21 June, spring equinox is around 20 March and autumnal equinox is about 22 or 23 September. [126] Common carbonate minerals include calcite (found in limestone) and dolomite. In regards to land, the continent of Asia covers about 30% of all the land, having around 60% of the world’s population. [125] The third form of rock material found on Earth is metamorphic rock, which is created from the transformation of pre-existing rock types through high pressures, high temperatures, or both. [108] Because much of the heat is provided by radioactive decay, scientists postulate that early in Earth's history, before isotopes with short half-lives were depleted, Earth's heat production was much higher. Much of Earth's polar regions are covered in ice. The Earth is divided into 7 continents that constantl… Ions and electrons of the solar wind are deflected by the magnetosphere; solar wind pressure compresses the dayside of the magnetosphere, to about 10 Earth radii, and extends the nightside magnetosphere into a long tail. earth definition: 1. the planet third in order of distance from the sun, between Venus and Mars; the world on whichâ¦. Earth provides liquid water—an environment where complex organic molecules can assemble and interact, and sufficient energy to sustain metabolism. B1 [ S or U ] (also Earth) the planet third in order of distance from the sun, between Venus and Mars; the world on which we live: The earth takes approximately 365 1/4 days to go round the sun. The result is atmospheric circulation that drives the weather and climate through redistribution of thermal energy. At approximately 3 Gyr, twice the present-day heat would have been produced, increasing the rates of mantle convection and plate tectonics, and allowing the production of uncommon igneous rocks such as komatiites that are rarely formed today. [232] Most of the growth is expected to take place in sub-Saharan Africa. The development of agriculture, and then civilization, led to humans having an influence on Earth and the nature and quantity of other life forms that continues to this day. [30], There are a number of adjectives for the planet Earth. During the summer, the day lasts longer, and the Sun climbs higher in the sky. [138] Charged particles are contained within the magnetosphere; the plasmasphere is defined by low-energy particles that essentially follow magnetic field lines as Earth rotates. 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