Which of These Is the BEST Explanation for the Origin

question 104

Multiple Choice

Which of these is the BEST explanation for the origin of the Moon?

• A) The Moon was created in its orbit around Earth by the same process that produced Earth, namely the collision of planetesimals that had formed by condensation and accretion of gas and dust.
• B) The Moon was created by the process described in (A) but at some other location in the solar system.
• C) While Earth was semimolten early in its formation, a chunk of material was flung out of it. It went into orbit and evolved to become the Moon.
• D) The Moon was created by the process described in (C) except that the ejection was caused by a large impact of some object or objects on Earth.

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