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Pollution of the Hydrosphere

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Presentation on theme: "Pollution of the Hydrosphere"— Presentation transcript:

1 Pollution of the Hydrosphere
Chapter 28 Pollution of the Hydrosphere

2 Sediment Pollution Rapid introduction of sediments into water ecosystems due to runoff Sources include: exposed agricultural fields clear cut logging construction sites

3 Effects of sediment pollution
Hurts aquatic organisms reduces the amount of photosynthesis that can occur in water reduces the ability to absorb oxygen may clog gills

4 Nutrient Pollution An increase in nutrients in an aquatic ecosystem
Leads to a rapid increase in growth of plants and algae Algal bloom is a rapid increase in algae due to the introduction of nutrient fertilizers into an ecosystem.

5 Eutrophication Nutrient pollution due to an increase in nitrates and phosphates Caused by use of fertilizers, leakage from septic/sewage systems

6 Nutrient Pollution (Eutrophication)
Sources are: Detergents Nitrogen compounds Runoff from streets and lawns Fertilizers from agriculture Discharges of sewage treatment plants and septic tanks

7 Effects of Eutrophication
Hurts aquatic organisms Reduces amount of light for photosynthesis Increases the amount of dying algae Results in bacterial growth that depletes oxygen in the water Decreased dissolved oxygen creates hypoxic (low/no oxygen) conditions, toxic to living organisms

8 Toxic Organic Compounds
ORGANIC (natural) = contains CARBON! Examples: Oil, Gasoline, Pesticides Hurts aquatic organisms: heavy oil pollution in the water can be deadly

9 BP Oil Spill (2010) Gulf of Mexico
In April 2010 an explosion on the Deep water Horizon drilling rig killed 11 men and sent millions of gallons of oil gushing into the Gulf of Mexico

10 Toxic Inorganic Compounds
It includes synthetic industrial chemicals and heavy metals, such as: Lead, Mercury, Arsenic Sources include: poor waste disposal toxic chemicals infiltrating and contaminating groundwater May be worse than toxic organic compounds because they can remain deadly for years and usually are not broken down naturally.

11 Disease-Causing Agents
Specific organisms that cause or spread diseases, such as viruses and bacteria. Waterborne illnesses is a type of disease caused by an organism that lives in water. Some examples are: Typhoid Malaria Hepatitis

12 Disease-Causing Agents
Wastewater: polluted water that is unfit for drinking or for introduction into the environment because it has been previously used and contaminated Wastewater affects organisms Can contaminate shellfish and other fish Humans may eat contaminated fish and develop health problems


14 Thermal Pollution Caused by a change in temperature.
The temperature of the water and the amount of dissolved oxygen is an inverse (opposite) relationship. Nuclear power causes thermal pollution Water used for cooling towers increases the temperature of surface water when released Aquatic animals need a constant temperature to survive


16 Thermal Pollution Construction of dams causes thermal pollution by lowering water temperature The temperature of the river drops about 10 degrees Native fish cannot tolerate the temperature change.

17 Test Your Knowledge 1. The most widespread pollution is.. Sediment Pollution 2. The enrichment of fertilizers in an aquatic ecosystem is called... Nutrient Pollution 3. Runoff from a construction site can result in.. Decreased Photosynthesis

18 Test Your Knowledge (cont.)
4. Leaking septic systems located around lakes and ponds can cause.. Nutrient Pollution 5. A rapid increase in the population of aquatic plants is known as.. Algal Bloom 6. Increasing amounts of nitrates and phosphate fertilizers in water cause.. Eutrophication

19 Test Your Knowledge (cont.)
7. As the temperature of the water increases, what happens to the level of dissolved oxygen within the water? It Decreases 8. What is the main source of waterborne illnesses? Wastewater 9. PCB’s are an example of what? Toxic Inorganic Compounds

20 Test Your Knowledge (cont.)
10. An increase or decrease in water temperature caused by human activity is known as what? Thermal Pollution

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