Earth

The Earth is the third planet from the Sun and the only astronomical object known to harbor life.

29% of the Earth's surface is covered by land. The remaining 71% is covered with water, these bodies constitute the hydrosphere. Earth's outer lithosphere is divided into several rigid different tectonic plates. These plates migrate across the surface over the course of millions of years. The Earth's interior remains active with a solid iron inner core. There is also a liquid outer core, which generates the Earth's magnetic field. The convective mantle drives plate tectonics. 

The atmosphere of the Earth consists mostly of nitrogen and oxygen. 

The Earth's gravity interacts with other objects in space, especially the Moon. The Moon is the Earth's only permanent natural satellite.