surface water evaporating into the atmosphere planets moving around the Sun in an elliptical pattern glaciers melting because of increasing temperatures groundwater moving to the surface in an artesian well
I gave my students this multiple choice question: Gravity can be defined as a force of attraction between objects. The effects of gravity can be witnessed in many systems. Which of these actions is an example of gravity influencing other systems?

Only one answer is correct among these 4 choices:
- surface water evaporating into the atmosphere
- planets moving around the Sun in an elliptical pattern
- glaciers melting because of increasing temperatures
- groundwater moving to the surface in an artesian well

Could you tell me which one is correct?

planets moving around the Sun in an elliptical pattern