The _______ that feed on the raw sewage or dead algae in a body of water cause in increase in the biological oxygen demand.

A decline in dissolved oxygen levels in water cause large organisms like fish to _____.

When the dissolved oxygen levels decrease in a body of water, the process of _____ is accelerated.

Algae blooms of cyanobacteria are caused by the introduction of excess _____ from runoff containing fertilizers and manure.

The blue-green cyanobacteria that causes algae blooms releases _______ that are harmful to animals and humans.

The ______ fire of 1969 brought about the first water pollution laws.

The ______, passed in 1977, is a law that set allowable limits for various pollutants in surface waters.

The leading causes of impaired waters are ____.

Ocean pollution mainly falls into two categories:

Around 80% of all ocean pollution originated from activities ____.

The worst oil spill by volume occurred in 2010 when an oil rig, called ______, experienced a blowout in the Gulf of Mexico.

What was the name of the oil tanker that ran aground in 1989 that led to the Oil Pollution Act of 1990?

What nutrient is believed to be the main driver of algae blooms in Lake Erie?

The nutrients that drive the cyanobacteria algae blooms are found in ___ that runoff into our rivers and streams.

With regards to plastic waste in the ocean, which of the following is not correct?