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Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.
- History
Earth formed around 4.54 billion years ago, approximately...
- Internal structure
The internal structure of Earth are the layers of the Earth,...
- History
La Tierra (del latín Terra, 18 deidad romana equivalente a Gea, diosa griega de la feminidad y la fecundidad) es un planeta del sistema solar que gira alrededor de su estrella —el Sol — en la tercera órbita más interna. Es el más denso y el quinto mayor de los ocho planetas del sistema solar.
Artículos principales: Gran oxidación y Cianobacterias. Durante la mayor parte de la historia de la Tierra, no ha habido organismos multicelulares en la Tierra. Partes de su superficie pueden haberse parecido vagamente a esta vista de Marte, uno de los planetas vecinos de la Tierra.
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
Hace 21 horas · Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbor life.
The internal structure of Earth are the layers of the Earth, excluding its atmosphere and hydrosphere. The structure consists of an outer silicate solid crust , a highly viscous asthenosphere , and solid mantle , a liquid outer core whose flow generates the Earth's magnetic field , and a solid inner core .
Earth goes around the Sun once (one year) for every 365 1 ⁄ 4 times it turns around (one day). Earth is the only planet in the Solar System that has a large amount of liquid water on its surface. About 71% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet.
