Earth is the third planet from the Sun. It is a sphere that’s flattened at the poles; therefore, its equatorial diameter (12,756 km) is 43 km wider than its polar diameter. The atmosphere on Earth is 99% oxygen (20.95%) and nitrogen (78.08%). It has a large amount of water in its liquid state.
The atmospheric temperature ranges from -89.15°C to 56.7°C, with an average of 14.05°C. It is the largest rocky planet in the solar system. Earth has one satellite, the Moon, which exerts a great influence on the tides and the seasons.
The most abundant elements on the planet are oxygen, silicon, aluminum, and iron. Its composition, magnetic field, position, and orbit bring together a conglomerate of difficult conditions that have made the appearance, maintenance, and evolution of living beings possible from the early moments of its formation; it is the only planet with evidence of life.