Easy
What is the element consumed during decomposition in an aquatic environment, leading to hypoxia?
Oxygen
What do endocrine disruptors disrupt?
Bonus: 200 How do they do this.
Hormones
-Block the signal or mimic the signal
Infectious diseases are caused by _________
Pathogens
Identify three regulating services of a wetland
-Water purification
-Flood control
-Maintains water flow during dry periods
-CO2 control
What is the main reason persistent organic pollutants (POPs) are toxic to organisms?
They do not break down easily and can accumulate in the fat tissue of an organism.
Suspended sediments in water directly contribute to an increase in __________.
Turbidity
What is thermal pollution.
Bonus 200: Why can this be problematic for species
When heated water is discharged into a body of water.
Bonus: Causes in increase in temp, meaning a decrease in DO. This can force species to leave or in some cases die.
Describe the second step in a sewage treatment plant.
Secondary Treatment: Bacteria perform aerobic decomposition to break down organic matter in an aeration tank.
Identify two oil spill clean up methods.
-Using skimmers to collect the oil
-Using floating booms to contain the oil
-Using microbes to break down the oil
-Using chemicals to break down the oil
What is considered to be one of the most hazardous methods used to clean up an oil spill.
Using chemical dispersants to break down the oil
Describe the first step in a wastewater treatment plant.
Physical removal: removal of solid objects such as rocks, sticks, and toys.
An abiotic factor likely to be affected by the introduction of an organic pollutant in a waterway.
Dissolved Oxygen
Identify three consequences that might result from an oil spill in the ocean.
-Economic loss to fishing
-Loss of Tourism
-Death of marine organisms
-Long term damage to aquatic ecosystem
Identify the four main threats to wetlands
-Commercial development
-Dam construction
-Agriculture and industrial activity pollution
-Overfishing
What is the name given to cleaning up sites contaminated with hazardous substances.
Remediation
What is a marine dead zone
A hypoxic region lacking marine life. As a results of a very low DO level.
Identify two reasons why plastic in the oceans is problematic.
-Collects in specific regions
-Breaks down very slowly, then into microplastics
-Organisms can consume it or get tangled in it
Identify 3 diseases/pathogens mosquitoes are the vectors in the transmission of.
Malaria, Zika virus, and West Nile virus
What does The Clean Water act primarily regulates?
The DISCHARGE of pollutants into water.
What is the most dangerous form of mercury to humans?
Methylmercury
An acute measure of the toxicity of a substance is given by the _______.
LD50
Describe the final step in a wastewater treatment plant, prior to the re-release of the water.
Tertiary treatment and disinfection: Removes final impurities and pollutants like nitrogen/phosphorous based chemicals
-Disinfection uses Chlorine, Ozone, and/or UV light
What is the purpose of a leachate collection system in a modern sanitary landfill?
Collect and remove contaminated water for treatment.
Identify two factors of an Oligotrophic water
-Low nutrient levels
-stable plant and algae populations
-high DO
Identify all steps of Eutrophication.
-Excess nutrients from human means reaches a waterway increasing the nutrients
-Algae begin to rapidly reproduce (algae blooms).
-As the algae die and fall to bottom, oxygen-consuming microbes digest the dead cells reducing dissolved oxygen levels.
-Leading to Hypoxic waterways that have low dissolved oxygen levels (dead zones).