What is the most common source of energy for surface currents? differences in water density temperature wind differences in salinity

## Step 1<br />Surface currents are primarily driven by the wind. The wind exerts frictional forces on the water surface, causing the water to move and form currents. <br /><br />## Step 2<br />While temperature and salinity differences can affect the density of seawater, leading to thermohaline circulation, they are not the primary drivers of surface currents. <br /><br />## Step 3<br />Differences in water density, which can be caused by variations in temperature and salinity, are more influential in driving deep ocean currents rather than surface currents. <br /><br />## Step 4<br />Therefore, among the given options, wind is the most common source of energy for surface currents.