Question

which of the following will increase the salt concentration in seawater? precipitation ice cap melting evaporation runoff

Explanation:

• Precipitation adds fresh water to seawater, diluting the salt concentration.
• Ice - cap melting also adds fresh water (from melted ice which is mostly fresh), diluting the salt.
• Runoff (from land) is usually fresh water (unless it's runoff from a very salty area, but generally) and dilutes seawater.
• Evaporation removes water (as water vapor) from seawater. Since the amount of salt remains the same (salt does not evaporate easily), the salt concentration increases.

Answer:

evaporation