Earth, the third planet from the Sun, is a unique celestial body known for its ability to support life. It has a diameter of about 12,742 kilometers (7,918 miles) and is the fifth-largest planet in our solar system. Earth's surface is divided into seven continents and five major oceans, covering 71% of the surface with water. This blue planet has a diverse range of environments, from vast oceans and towering mountain ranges to expansive deserts and lush forests.