Why did scientists once think there were volcanoes on the moon? What evidence from the Apollo landings makes this unlikely

I think that my science teacher said that the moon is made up of the same material as earth. I'm not sure...

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Okay so I know I'm wayyyyyyyyy late but it was because the craters were so deep that they looked like they were coming out of the ground.

Scientists once thought there were volcanoes on the Moon primarily due to the presence of volcanic-like features on its surface. This belief was held because of the smooth plains and rare volcanic rocks that were collected during the Apollo missions.

To understand why scientists thought this, it's important to consider the evidence from the Apollo landings that challenged this idea. During the Apollo missions, the astronauts brought back moon rock samples, which were analyzed in detail. The chemical composition of these rocks indicated that they were not formed through volcanic processes. Instead, they resembled the type of rocks found on Earth that are created by the impact of large asteroids or comets.

Additionally, the examination of lunar craters provided insights into the Moon's geological history. These craters showed that there was a significant amount of impact activity on the Moon's surface. The presence of impact craters suggested that the volcanic-like features were likely the result of ancient impact events rather than volcanic activity.

Furthermore, the lack of volcanic gases and volcanic activity on the Moon further contributed to the notion that there are no currently active volcanoes. Volcanoes typically release gases like sulfur dioxide, carbon dioxide, and water vapor. The vast absence of these gases in the Moon's thin atmosphere indicates the absence of recent volcanic activity.

Overall, the analysis of lunar rock samples, examination of impact craters, and absence of volcanic gases have led scientists to conclude that the volcanic-like features on the Moon's surface are primarily the result of ancient impact events, rather than active volcanism.