Final answer:
The false statement about the Moon is that the maria have fewer craters than the highlands, implying they are older. In reality, fewer craters in the maria indicate they are geologically younger than the highlands.
Step-by-step explanation:
The statement that is not true about the Moon is 'The maria have fewer craters than the highlands. This is evidence that the maria are older than the highlands.'
This is incorrect because the maria actually have fewer craters than the highlands, which is evidence that the maria are younger rather than older. The maria, dark volcanic plains formed primarily by eruptions between 3.3 and 3.8 billion years ago, are younger than the heavily cratered highlands which are made of rocks more than 4 billion years old.
The other statements given in question about the Moon are true. We have learned from Apollo mission lunar samples that the Moon is geologically dead and formed about 4.5 billion years ago, alongside Earth. Although the Moon rocks returned by Apollo are predominantly dry, more recent discoveries have found traces of water near the lunar poles. Additionally, the Moon can indeed sometimes be visible during the day due to its orbit and reflective surface.