<human>:  What are some interesting facts about Earth?
<bot>: 
1. Earth is the only planet known to have an atmosphere containing free oxygen.
2. Earth is the only planet known to have liquid water on its surface.
3. Earth is the third planet from the sun and the only planet known to have life.
4. Earth has the highest mountain, Mt. Everest at 8,848 meters above sea level.
5. Earth has an average temperature of 60Â°F (
15.5Â°C).
6. Earth has a population of 
7.8 billion people.
7. Earth has a circumference of 40,075 kilometers (24,901 miles).
8. Earth is the fifth largest planet in the Solar System.
9. Earth orbits the sun at an average distance of 
149.6 million kilometers (
92.9 million miles).
10. Earth has a wet area of more than 
3.5 trillion square kilometers (
1.3 trillion square miles).