GEOLOGY

Detailed explanation-1: -Oligotrophic lakes generally host very little or no aquatic vegetation and are relatively clear, while eutrophic lakes tend to host large quantities of organisms, including algal blooms. Each trophic class supports different types of fish and other organisms, as well.

Detailed explanation-2: -Harmful algal blooms, dead zones, and fish kills are the results of a process called eutrophication-which occurs when the environment becomes enriched with nutrients, increasing the amount of plant and algae growth to estuaries and coastal waters.

Detailed explanation-3: -A second way lakes can go through succession is through a process called eutrophication. This happens when nutrients are washed into the lake from the surrounding area, or watershed. Nutrients can include animal waste and fertilizers, which scientists call nitrates, and eroded inorganic material called phosphates.

Detailed explanation-4: -Eutrophication is the process in which a water body becomes overly enriched with nutrients, leading to plentiful growth of simple plant life. The excessive growth (or bloom) of algae and plankton in a water body are indicators of this process.