Passage Summary: There's a line of craters that could be from space rocks or volcanoes. Since they are in a line, they probably all have the same cause. Because they happened at different times, the author thinks they are volcanic.

Conclusion: The craters were likely created by volcanic activity rather than by meteorites.

Reasoning: The craters are in a straight line, which suggests a single type of cause, and they were formed at different times.

Analysis: The author is using the 'different ages' of the craters to rule out meteorites. This assumes that a string of meteorites would likely hit all at once, whereas volcanic activity can occur along a line over a long period. To strengthen this, we need an answer that confirms this distinction. Look for information suggesting that meteorites hitting the same spot at vastly different times is extremely improbable, or that volcanic vents frequently erupt in sequence over many years.