drought and flooding high tides and low tides clear skies and cloudy skies hot weather and cool weather
I gave my students this multiple choice question: Which of these natural events occurs at time intervals that are the most regular?

Only one answer is correct among these 4 choices:
- drought and flooding
- high tides and low tides
- clear skies and cloudy skies
- hot weather and cool weather

Could you tell me which one is correct?

high tides and low tides