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Planet Earth Questions

Earth formation
How big is our planet earth
How do we find out about the history of earth?
How do we know how many days to have in a year?
How far away from earth is space?
How far from earth is the moon?
How long does a day last?
How long does a month last?
How old is the earth?
The area where all the water flows into a river
What are all the objects in the earth that can be seen from the moon?
What did earth used to be like in the past?
What is the purpose of a leap year?
Why is the earth closer to the sun than jupiter?

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Category: astronomy