How deep is the atmosphere?

answer in your own words please.
1 Why is the question, “How deep is the atmosphere” difficult to answer? Explain. You may also want to consider the following in order to give a more complete response:
At what height does the atmosphere end and space begin?
Is the International Space Station orbiting at a height that could still be considered part of Earth’s atmosphere
2 Describe and explain what is meant by Earth’s revolution and rotation. What are the effects?
3 The plane of the ecliptic coincides with the plane of the equator on two days per year. Explain.

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