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Questions for Discussion: The Origin of the Moon

Explain the theory of how and when the Moon formed.
Why was the anorthosite rock brought back from the Moon by Apollo 15 called the "genesis" rock? Explain in detail.
The oldest rock on Earth is 3.9 billion years old, and it is a metamorphic rock. Why do we believe Earth is actually at least 4.5 billion years old?
In what ways does the Moon influence characteristics of Earth?
What is meant by an Earth-moon system?