The given visual diagram illustrates the process of mercury deviously breaking into the food chain of the sea creatures. Overall, this process can be split into two phases: above water, below water.
Regarding the first phase of the process or the “above water” phase, mercury has 2 sources through which it can pass to the water through the air, the first one being volcanic eruption which not only secretes poisonous gases with mercury, but also shoots lava. The second source is the coal plant which, as a consequence of some process, emits gases which coincidentally has mercury in it, and with the help of the sea breeze the harmful gases go straight to the ocean. The other way that mercury can enter the ocean is through the mines, the mercury enters the ocean via water flow in the mines, after getting mixed into the water as a result of work in the mines.
After introducing itself to the ocean, mercury will get consumed by the local krill population, not aware of the fact that this will poison the whole food chain. Then, the small sized fish, salmon, pollock, and oysters, will feed on the krill, while also taking in the mercury which was previously consumed by the krill. Consequently, mid sized fish like trout and tuna will prey on the smaller fish, also taking in the mercury. Finally the biggest types of fish like sharks, pikes, and albacores will hunt on the mid sized fish summing up the process of fully injecting mercury in the whole food chain.