The three correct answers describing the difference between solar wind and a geomagnetic storm are:
- Geomagnetic storms are associated with CMEs; solar wind is associated with the constant activity in the sun.
- Geomagnetic storms occur only occasionally; solar wind is constant.
- Solar wind sometimes results in geomagnetic storms; geomagnetic storms do not cause solar wind.
These statements accurately highlight the nature and characteristics of solar wind and geomagnetic storms.