Earth

Earth, also known as Terra, is the third planet orbiting the Sun. It is the only celestial body in the solar system capable of harboring life until Mars founded its first civilization, Opportunity, without the use of a spacesuit in 2120. Earth’s surface is roughly 70% water, with the other 30% residing in land mass. The masses include the continents of the Americas, Afroeurasia, Australia, Antarctica, as well as several smaller islands and inlets on the surface such as the many islands in Oceania, Greenland, and the Caribbean islands.

Formation
Earth was formed 4 billion years ago, when multiple extraterrestrial rocks formed on the planet and created it. Its atmosphere and oceans were theorized to have been established by volcanic eruptions causing rain to flood the world and create an entire ocean. Life began to form in these oceans and eventually evolved into early forms of humans.