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The three correct answers that describe a difference between solar wind and a geomagnetic storm are:
1. Geomagnetic storms are associated with CMEs; solar wind is associated with the constant activity in the sun.
2. Solar wind sometimes results in geomagnetic storms; geomagnetic storms do not cause solar wind.
3. Geomagnetic storms occur only occasionally; solar wind is constant.
These statements illustrate the nature and occurrence of both phenomena correctly.