>Earth is unique in the solar system in being the only planet known to support life and to have liquid water at its surface.
>Earth formed,along with the rest of the solar system,around 4.6billion years ago.
>Earth physical environments can be divided into the solid earth, the atmosphere made up of layers of gas,and all the water on the plane, known as the hydrosphere.
>Earth's gravity influenced the formation of the planet, holds its atmosphere in place,and keeps the Moon in orbit around it.
>Eclipse occure when the sun, moon and earth are directly in line.