![]() Below the planet's surface lies the crust, consisting of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. The other 29.2% of the Earth's surface is land, consisting of continents and islands, and is widely covered by vegetation. Most of all other water is retained in Earth's polar regions, with large sheets of ice covering ocean and land, dwarfing Earth's groundwater, lakes, rivers and atmospheric water. Earth is the only planet to sustain liquid surface water, with ocean water extending over 70.8% of the planet, making it 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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