Presentation on theme: "Pollution of the Hydrosphere"— Presentation transcript:
1 Pollution of the Hydrosphere Chapter 28Pollution of the Hydrosphere
2 Sediment PollutionRapid introduction of sediments into water ecosystems due to runoffSources include:exposed agricultural fieldsclear cut loggingconstruction sites
3 Effects of sediment pollution Hurts aquatic organismsreduces the amount of photosynthesis that can occur in waterreduces the ability to absorb oxygenmay clog gills
4 Nutrient Pollution An increase in nutrients in an aquatic ecosystem Leads to a rapid increase in growth of plants and algaeAlgal bloom is a rapid increase in algae due to the introduction of nutrient fertilizers into an ecosystem.
5 EutrophicationNutrient pollution due to an increase in nitrates and phosphatesCaused by use of fertilizers, leakage from septic/sewage systems
6 Nutrient Pollution (Eutrophication) Sources are:DetergentsNitrogen compoundsRunoff from streets and lawnsFertilizers from agricultureDischarges of sewage treatment plants and septic tanks
7 Effects of Eutrophication Hurts aquatic organismsReduces amount of light for photosynthesisIncreases the amount of dying algaeResults in bacterial growth that depletes oxygen in the waterDecreased dissolved oxygen creates hypoxic (low/no oxygen) conditions, toxic to living organisms
8 Toxic Organic Compounds ORGANIC (natural) = contains CARBON!Examples: Oil, Gasoline, PesticidesHurts 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, ArsenicSources include:poor waste disposaltoxic chemicals infiltrating and contaminating groundwaterMay 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:TyphoidMalariaHepatitis
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 contaminatedWastewater affects organismsCan contaminate shellfish and other fishHumans 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 pollutionWater used for cooling towers increases the temperature of surface water when releasedAquatic animals need a constant temperature to survive
16 Thermal PollutionConstruction of dams causes thermal pollution by lowering water temperatureThe temperature of the river drops about 10 degreesNative fish cannot tolerate the temperature change.
17 Test Your Knowledge1. 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