You are presented with the question "What occurs in water as the moon revolves around Earth?" and the following answer choices: 
- tides
 - gravity
 - liquid
 - energy
 - pollution
 - heat
 - earthquakes
 - erosion

Now knowing that the moon revolving around the Earth causes the phases of the moon and tides are cyclical and closely follow the phases of the moon, choose the best answer.


 

 tides        