3/16 A/B DayLEQ: How do we use different measurements todetermine if our hydrosphere is healthy?1. What is desalination?2. How does the hydrosphere give us air to breathe?3. What is the difference between a point- and a non-point pollutant?4. Give an example of a point-source pollutant and anon-point-source pollutant5. What is one thing you can do to help keep ourhydrosphere clean?
Today’s LEQ: How do we use different measurements to determine if our hydrosphere is healthy?By the end of today, you should be able to…Examine the pH level, turbidity, nitrate level, oxygen level, and bio-indicators to determine if a body of water is healthy or unhealthy!
How are dissolved oxygen and water temperature related? Temperature: Dissolved Oxygen: 20° 9 mg/lDissolved Oxygen 40° 6 mg/l 60 ° 5 mg/l 80 ° 3 mg/l As the temperature increases, the amount of dissolved oxygen [increases/decreases]. Water Temperature
Good or Bad Water Quality? Good Dissolved Oxygen Still Pretty Good TERRIBLE! Water Temperature
Evaluate: Water Health in North Carolina Cape Fear River Lake Michie• 25° Celcius • 38° Celcius (68 ° Farenheit) (100.4 ° Farenheit)• Dissolved Oxygen: • Dissolved Oxygen: 8 mg/l 2 mg/l Which body of fresh water is healthier? How do you know?
What is likely the cause of the low oxygen levels in July?a) High temperaturesb) Lots of algae diedc) More fish are being bornd) Fewer bubbles are in the water
Draw this in your notes:pH Scale: scale from 0-14 that measuresthe levels of acids and bases in a liquid
Nitrates (nutrients from fertilizer) arewashed into hydrosphere This causes algal blooms (when too much algae grows in an area)
Discovery Education: Nutrient PollutionWhile you’re watching…HOW DO ALGAL BLOOMS DAMAGE THE HYDROSPHERE?
Nitrates (nutrients from fertilizer) are washed into hydrosphere This causes algal blooms (when too much algae grows in an area) Algal blooms damage the hydrosphere by:-using up all of water’s dissolved oxygen-releasing toxic chemicals-blocking out sunlight
EOG Question:Which of the following are indicators of a healthywater system? a) high nitrates, high chlorophyll, low temperature b) low temperature, high dissolved oxygen, neutral pH c) low pH, high nitrates, low dissolved oxygen d) low turbidity, high chlorophyll, high temperature
EOG Question:What does it mean when a scientist says alake has a high turbidity? a) the water has a lot of particles in it b) the water is very clear c) the water is very basic d) the water can support many organisms
Let’s Practice!Water Quality Independent Practice
Summarizer:A student takes measurements from a lake in EastCharlotte. The student finds the following:Turbidity: HighDissolved Oxygen: lowTemperature: 111 ° FahrenheitpH Level: 3.1Is this a healthy lake or an unhealthy lake? Explainyour answer in 5-7 sentences. BE SURE TO INCLUDE aprediction about what the lake looks like (Do youthink there are there any bio-indicators? Do youthink there could possibly be an algal bloom?)