Life on Earth

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Dear Teachers: Step Away From the Elf The Reading Coach @ Intuitive Behavioral and Educational

World Astronomical symbol of EarthThe Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 72

Earth is the 3 rd planet from the sunlight and the only astronomical item 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 interacts with other things in space, especially the Sun and the Moon, Earth's only natural satellite. Earth revolves around the sunlight in 365. 26 days, a period known as an Earth year. During 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 on Earth. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth's orientation on its axis, and gradually 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 inflexible 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 29% is land including regions and islands that collectively have many lakes, waterways and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are covered 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 inner core, a liquid external core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.

Inside the first billion years of Earth's history, life appeared in the seas and commenced 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 combo of Earth's distance from the Sunshine, 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. More than 99% of most species that ever lived on Planet are extinct. Estimates of the number of varieties on the planet today vary extensively; most species have not been described. Over several. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their success.[40] Humans have developed diverse societies and civilizations; politically, the world has about 200 sovereign says.

The present day English word Planet developed from a broad variety of Middle English forms, which derived from a vintage English noun most often spelled eorðe. That has cognates in most 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 Ancient greek γῆ (gē): the earth, the soil, dry land, your 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 since 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 earth. By Early Modern British, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced along with other heavenly physiques. More recently, the name is sometimes simply given as Earth, by example with the names of the other planets. House styles now vary: Oxford spelling recognizes the lowercase form as the utmost 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 preceded by the (e. g. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? ".