Marine Phosphorites Formation

The movement of cold water from the ocean's depth to another depth level

The sinking of warm, nutrient-poor water from the ocean's surface to the depth

The movement of warm water from the surface to the ocean's depth

The rise of cold, nutrient-rich water from the ocean's depth to the surface (correct)

Direct precipitation of phosphate from sea water

Combination of organic matter, phosphorous, skeletal debris, and phosphate (correct)

Presence of high oxygen levels in the overlying sea floor

The absence of phytoplanktons in the surface water

Presence of oxygen-rich overlying sea floor

High organic productivity and presence of phytoplanktons in the surface water (correct)

Absence of fish mortality in the area of upwelling

Low organic productivity and absence of phytoplanktons in the surface water