volcanic eruptions earthquake activity phases of the moon precipitation amounts
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Scientists know that Earth is constantly changing. They are familiar with the processes that are repeated daily, monthly, and yearly. Which of these is a natural event that can be predicted to occur monthly?
Possibilities:
- volcanic eruptions
- earthquake activity
- phases of the moon
- precipitation amounts

phases of the moon