visiting the Moon a stone eroding in a river living on the space station a ship floating on the ocean
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The meanings of mass and weight can often be confused. Which is an example of a change in both mass and weight?
Possibilities:
- visiting the Moon
- a stone eroding in a river
- living on the space station
- a ship floating on the ocean

a stone eroding in a river