Summary from the Source I went and summarized the source in my own words Science shows that the Earth formed around  billion years ago The organisms that live on Earth have completely changed its air atmosphere this is called a biosphere  of Earths surface is covered in salt water oceans Earth is the only place in the Solar System where liquid water is known to exist at present The other  is made of rocky land in the shape of continents and islands  Earth interacts with other objects in the Solar System particularly the Sun and the Moon The Earth orbits or goes around the Sun roughly once every  days One spin is called a day and one orbit around the Sun is called a year This is why there are  days in a year but a leap day is added once every  years Itd be great if someone could add that for me I have a rocket to catch Bye for now