Please answer the questions below carefully.
1. According to the article, how many years ago was the planet earth formed?
2. What are the four main layers of the earth?
3. What is lithosphere? What is the other name for "lithosphere"?
4. The largest layer of the earth is the mantle. What is it made up of?
5. What do you call the third layer of the earth?
6. Which do you think among the four layers of the earth is the thinnest layer?
7. What layer of the earth can be regarded as a ball of very hot materials?
8. What do you call the innermost layer of the earth?
9. How thick is the inner core?
10. The earth is enveloped by atmosphere. What are the five major layers of the atmosphere?
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