The Earth is the 3rd planet from the sun. It is the only planet known to have life on it. The earth formed around 4.5 bilion years ago. the earth is one of four rocky planets on the inside of the polar system. the other three are mercury, venus and mars. The large mass of the Sun males the Earth move around it, just as the mass of the earth makes the moon move around it. the earth also turns around in space. so different parts face the sun at different times. the earth goes around the sun once for every 365 1/4 times it turns all the way around (one day). the moon goes around the earth about every 27days, and reflects light from the sun. as the earth goes around the sun at the same time, the changing light of the moon takes about 291/2 days to go from dark to bright to dark again. that is where the idea came from. however, now months month have 30 or 31 days. so fit into one year. the earth has a large amount of liquid of water.
about 71% of the earth covered by water or oceans. because of this, it is sometimes called the Blue Planet.
Because of its water, the earth is home of species of plants and animals. the things that live on earth have changed its surface greatly. such as early cyanobacteria changed te air and give it oxygen. the living part of earths surface is callled the "biosphere".
orbit and turningEdit
the earth is the part of the 8 planets and many thousands bodies that move around the sun as its solar system. the solar system is moving through the orion arm of the miky way galaxy now, and will be for about next ten thousands years. the earth is generally 93,0000,000miles or 150,000,000 km away from the sun, this distance is named an artsonomical unit. the earth moves along its way at an average speed of about 19 milles or 30 km a second. the earth turns all the way around about 365(1/4) times in the time it take earth to in all way around the sun.