Posted in Our Solar System

Our Solar System : Earth

1. Earth is the third planet from the – Sun

2. It is only the fifth largest planet in terms of – size and mass

3. Earth was formed somewhere around – 4.54 billion years ago

4. Its name is derived from the – Old English word ertha and the Anglo-Saxon word erda

5. The Earth was once believed to be the – centre of the universe

6. Earth is the most dense planet in the – solar system

7. Earth’s atmosphere is composed of – 78% nitrogen, 21% oxygen, and trace amounts of other gases including argon and carbon dioxide

8. Earth has a very powerful – magnetic field

9. 70% of the Earth’s surface is covered by – water

10. Earth’s water was initially trapped within – the planet

11. The highest point found on Earth is – Mount Everest

12. The lowest point on Earth is called – Challenger Deep

13. Earth has one of the most circular orbits of all the – eight planets

14. A year on Earth lasts just over – 365 days

15. Earth has one large natural satellite, known as the – Moon

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