A. pressure increase as depth increases
B. temperature decreases with depth
C. light decreases with depth
D. salinity of water varies at surface, but remains fairly constant deeper.
Light penetrates to about 200 m. Near the surface, temperature is affected by weather. In the transition zone, the temperature drops rapidly. In the deep zone, water is always extremely cold. Rainfall decreases salinity near the surface, while evaporation increases salinity in the warm, dry areas. Below the surface zone, salinity remains fairly constant throughout the water column. Pressure increases with depth.