Consider the following statements:

1. Surface-ocean salinity depends substantially on the balance between evaporation and precipitation.
2. River inflow affects coastal salinity, while freezing and thawing influence salinity in polar regions.
3. Wind has no effect on salinity because it cannot transfer ocean water between areas.
4. Ocean currents contribute to salinity variation, and salinity is interrelated with temperature and density.

Which of the statements given above are correct?