It has a composition of primarily nitrogen and oxygen. Earth's liquid outer core generates a magnetic field that shapes the magnetosphere of Earth, largely deflecting destructive solar winds and cosmic radiation.Įarth has an atmosphere, which sustains Earth's surface conditions and protects it from most meteoroids and UV-light at entry. Below Earth's surface material lies Earth's crust consisting of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Land, consisting of continents and islands, extends over 29.2% of the Earth and is widely covered by vegetation. Earth's polar regions currently retain most of all other water with large sheets of ice covering ocean and land, dwarfing Earth's groundwater, lakes, rivers and atmospheric water. While Earth may not contain the largest volumes of water in the Solar System, only Earth sustains liquid surface water, extending over 70.8% of the Earth with its ocean, making Earth an ocean world. Earth is the third planet from the Sun and the only place known in the universe where life has originated and found habitability.
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