Question

1. salinity of seawater increases:

near the mouth of rivers.
with a decrease in depth.
as evaporation increases.
with an increase in rain.
around ice as it melts in spring.

Explanation:

Salinity is the amount of salt in seawater. When evaporation increases, water (the solvent) is removed, leaving more salt (the solute) per unit volume of seawater, thus increasing salinity. Near river mouths, freshwater (low - salinity) is added, decreasing seawater salinity. As depth decreases, there is no direct consistent increase in salinity. An increase in rain adds freshwater, decreasing salinity. When ice melts (e.g., in spring), it adds freshwater (from the ice, which is low - salinity), decreasing the salinity of the surrounding seawater.

Answer:

as evaporation increases.