"Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. 29.2% of Earth´s surface is land consisting ...
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of continents and islands. The remaining 70.8% is covered with water, mostly by oceans, seas, gulfs, and other salt-water bodies, but also by lakes, rivers, and other freshwater, which together constitute the hydrosphere. Much of Earth´s polar regions is covered in ice. Earth´s outer layer is divided into several rigid tectonic plates[list] that migrate across the surface over many millions of years, while its interior remains active with a solid iron inner core, a liquid outer core that generates Earth´s magnetic field, and a convective mantle that drives plate tectonics." - (en.wikipedia.org 23.12.2021)
