Question

conceptual model of mercury contamination
mercury released from burning coal
air
soil water
crops fish
people
health effects from mercury poisoning
physical
conceptual
mathematical
graphical

Explanation:

The model shows the pathway of mercury contamination from coal - burning to its impact on people. It is a visual representation of concepts related to mercury's movement through different environmental media and its health effects, so it is a conceptual model.

Answer:

conceptual