The three correct answers that describe the differences between solar wind and geomagnetic storms are:
1. **Geomagnetic storms occur only occasionally; solar wind is constant.**
2. **Solar wind sometimes results in geomagnetic storms; geomagnetic storms do not cause solar wind.**
3. **Geomagnetic storms are associated with CMEs; solar wind is associated with the constant activity in the sun.**
These answers highlight the nature of solar wind as a continuous flow of charged particles from the Sun and the sporadic occurrence of geomagnetic storms, which are often triggered by specific solar events like coronal mass ejections (CMEs).