The earth is the third planet from the sun and is the largest of the terrestrial planets. The Earth was formed approximately 4.54 billion years ago and is the only known planet to support life. it has an equatorial diameter of 12,756 km and a polar diameter of 12,714 km. The Earth is at distance of 149,597,900 km from the sun and orbits round the sun at a speed of 107,220 km per hour, making one revolution in 365 days, 5 hours, 48 minutes and 45.51 seconds.it completes one rotation on its axis every 23 hours,56 minutes and 4.091 seconds.
The Earth is a unique planet, it is a bit pearshaped rather then a true sphere. The Earth is considered a solid ,rigid mass with a dense core of magnetic, probably metallic material.it is the only planet containing ample water and air around it. The temperature on the earth is also suitable for human life.