Earth

Earth is the only known planet to support life, thanks to a unique combination of features: liquid water, a protective atmosphere, a stable climate, and an active geology. About 71% of Earth’s surface is covered by oceans, which moderate global temperatures and support millions of species.

Earth’s atmosphere is made of 78% nitrogen, 21% oxygen, and trace gases like carbon dioxide. The ozone layer absorbs harmful ultraviolet radiation, allowing complex life to thrive on the surface. The planet’s magnetic field, generated by the rotation of the molten iron core, shields us from solar wind and cosmic radiation.

Earth has a dynamic crust divided into tectonic plates that slowly move, creating mountains, trenches, earthquakes, and volcanoes. This geological activity constantly renews the surface and cycles nutrients essential for life.

Our Moon plays a huge role in Earth’s stability. It controls tides, influences animal behavior, and stabilizes Earth’s axial tilt, which prevents wild climate swings and allows long-term habitability.