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Happy Earth Day u0026 Happy SpringFling! Where the Goodwill Goes

Planet Astronomical symbol of EarthTypically the 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. In accordance with radiometric dating and some other sources of evidence, Earth formed over 4. 5 billion years ago. Earth's gravity interacts with other things in space, especially the Sun and the Celestial satellite, Earth's only natural satellite tv. Earth revolves around the Sun in 365. 26 days, a period known as an Earth year. During 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 sea tides, stabilizes Earth's orientation on its axis, and steadily slows its rotator. Earth is the densest planet in the Photo voltaic System and the largest of the four terrestrial planets.

Earth's lithosphere is divided into several firm tectonic plates that migrate across the surface over periods of many hundreds of thousands of years. About 71% of Earth's surface is covered with water, generally by oceans. The remaining 29% is land comprising continents and islands that together have many lakes, streams and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are protected 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.

Within just the first billion years of Earth's history, life appeared in the seas and commenced to affect 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 combination of Globe's distance from the Sun, physical properties, and geological history have allowed life to evolve and flourish. In the good the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Above 99% of all species that ever lived on Earth are extinct. Estimates of the number of types on Earth today vary broadly; most species have not been described. Over several. 6 billion humans live on Earth and rely on its biosphere and natural resources for their your survival.[40] Humans have developed diverse societies and ethnicities; politically, the world has about 200 sovereign states.

The present day English word World developed from a wide variety of Middle English forms, which derived from a vintage English noun most often spelled eorðe. This has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already being utilized to translate the many senses of Latin terra and Ancient greek language γῆ (gē): the ground, their soil, dry land, the human 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 mom of Thor.

Originally, planet was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced along 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 identifies 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. g. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what in the world are you doing? ".

Earth PNG images free download