Question

1. Which of the following does not decrease salinity?

a. Precipitation

b. Sea-ice formation

c. River-water flow

d. Melting of sea ice

2. Practical salinity units are based upon

a. The conductivity of seawater

b. The mass of salts found after evaporation of a seawater sample

c. The carbon content of seawater

d. The chlorine plus calcium concentration of seawater

3. Ultraviolet light is important because

a. It is harmful to marine life, owing to the damage it does to DNA

b. It penetrates much deeper than other wavelengths of light and is important in photosynthesis

c. It causes beneficial warming of living tissues

d. It stimulates protein synthesis