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By Early Modern Englishmany nouns were capitalized, and the earth became and often remained the Earth, particularly when referenced along with other heavenly bodies.
More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets. Oxford spelling recognizes the lowercase form as the most common, with the capitalized form an acceptable variant.
Another convention capitalizes "Earth" when appearing as a name e. It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? The bodies in the Solar System formed and evolved with the Sun. In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into a circumstellar diskand then the planets grow out of that disk with the Sun.
A nebula contains gas, ice grains, and dust including primordial nuclides. Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanetsand comets. The two models  that explain land mass propose either a steady growth to the present-day forms  or, more likely, a rapid growth  early in Earth history  followed by a long-term steady continental area.
Over the period of hundreds of millions of years, the supercontinents have assembled and broken apart.Earth's radius is about 6, km and the radius of the core is about 3, km (the inner core radius is about 1, km&endash; a little more than two-thirds of the radius of the Moon).
Earth's mass is approximately x kg, and its . Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over billion years ago.
Origin of life and evolution. Life timeline. Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the center, while the lighter material created the crust. Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in to promote the ideas of ecology, encourage respect for life on earth, and highlight growing concern over pollution of the soil, air, and water.
Earth Day is now observed in nations with outdoor. The 25 Biggest Turning Points in Earth's History Photosynthesis. All life needs energy to survive, and the biggest source of energy for life on Earth is the Sun. The most prominent scientific theory about the origin of the Earth involves a spinning cloud of dust called a solar nebula.
This nebula is a product of the Big Bang. This nebula is a product of the Big Bang.