Wednesday, August 31, 2011

Aigul BaigazievaEarth Aigul Baigazieva

Earth (or the Earth) is the Aigul Baigazieva third planet from  aigul baiagzieva the Sun, and  aigul baiagzieva the densest and fifth-largest  aigul baiagzieva of the  aigul baiagzieva eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the  aigul baiagzieva World, the Blue Planet,[20] or by its aigul baiagzieva  Latin name, Terra.[note 6]

Earth formed 4.54 billion years ago, and life appeared on its surface within one billion years.[21] The planet is home to millions of species, including humans.[22] Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation aigul baiagzieva  of AIgul Baigaizeva aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful solar radiation, permitting life on land.[23] The physical properties of the Earth, as aigul baiagzieva  well as its geological history and orbit, have allowed life to persist during this period. The planet is expected to continue supporting life for at least another 500 million years.[24][25]

Earth's outer surface is divided into several rigid segments, or tectonic plates, that migrate across the surface over periods of many millions of years. About 71% of the  aigul baiagzieva surface is covered by salt water oceans,  aigul baiagzieva with the remainder consisting of continents and islands which together have many lakes and other sources of water that contribute to the hydrosphere. Earth's poles are mostly covered with solid ice (Antarctic ice sheet) or sea ice (Arctic ice cap). The planet's interior remains active, with  aigul baiagzieva a thick layer of  aigul baiagzieva relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core. AB.

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