3/16/12

3/16 A/B DayLEQ: How do we use different measurements to determine 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 a non-point-source pollutant5. What is one thing you can do to help keep our hydrosphere 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!

Focus Vocabulary:

141. pH142. Turbidity143. Algal bloom144. Nitrates145. Bio-indicator

What are some physical characteristics of someone who is sick?

Water can be sick too!

What physical characteristics do you see in the water in each picture?

Draw this in your notes:

Good Water Quality Bad Water Quality

Unscramble!

Clear

Muddy/Murky

Lots of

dissolved

oxygen

Cool

Hot

Very little dissolved oxygen

High acidity

(lots of acid)

Low acidity

(low amount

of acid)

How are dissolved oxygen and water temperature related?

Water Temperature

Dis

solv

ed O

xyge

n

Temperature: Dissolved Oxygen: 20° 40° 60 ° 80 °

9 mg/l6 mg/l5 mg/l

3 mg/l

As the temperature increases, the amount of dissolved oxygen [increases/decreases].

Good or Bad Water Quality?D

isso

lved

Oxy

gen

Water Temperature

Good

Still Pretty Good

TERRIBLE!

Temperature:Dissolved Oxygen Level:

CoolHigh

Temperature:Dissolved Oxygen Level:

HOTLOW

Evaluate: Water Health in North Carolina

Cape Fear River Lake Michie• 25° Celcius (68 ° Farenheit)

• Dissolved Oxygen: 8 mg/l

• 38° Celcius (100.4 ° Farenheit)

• Dissolved Oxygen: 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 measures the levels of acids and bases in a liquid

BrainPop: pH Scale

Draw this in your notes: pH Scale: scale from 0-14 that measures the levels of acids and bases in a liquid

Very Acidic

Very Basic

Neutral

Healthy Water!(Neutral)

ADD this to your notes: Good Water Bad Water Quality Quality

Lots of different species of algae

Algal Bloom!

pH Level: Around 7 (Neutral)

pH Level: Very high or very low

Evaluate: Water Health in North Carolina

Neuse River Lake Phelps• pH: 8.1 • pH: 2.4

Which body of fresh water is healthier? How do you know?

ADD this to your notes: Good Water Bad Water Quality Quality

Neutral pH (about 7)

Very high pH or very low pH

Draw this in your notes: Turbidity: measures how clear or muddy the water is

High Turbidity = unhealthy Low Turbidity = healthy

Turbidity: Low

Turbidity: High

Which one has the highest turbidity?

Which one has the highest turbidity?

Which one has the highest turbidity?

Evaluate: Water Health in North Carolina

Neuse River Lake Norman• High turbidity • Low turbidity

Which body of fresh water is healthier? How do you know?

Think-Pair-Share:

Can you think of an example where too much of a good thing becomes a bad thing?!

Make-Up?

Candy?

Spray-Tan?

Algae????

Too Much Algae = BAD!!!!!

Nitrates (nutrients from fertilizer) are washed into hydrosphere

This causes algal blooms (when too much algae grows in an area)

Discovery Education: Nutrient Pollution

While 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

Which water has high levels of nitrates?

Which water has high levels of nitrates?

ADD this to your notes: Good Water Bad Water Quality Quality

Normal algae levels

Algal Bloom!

ADD this to your notes: Good Water Bad Water Quality Quality

Low Nitrate Levels

High Nitrate levels

What months might there have been an algal bloom?

Break down the word:

What do you think a bio-indicator is?

Draw this in your notes: Bio-indicators: animals that are used to measure the health of water

Trout in water = healthy No Trout in water = unhealthy

Example: Trout can only live in healthy water

ADD this to your notes: Good Water Bad Water Quality Quality

Presence of bio-indicators

No bio-indicator

BrainPop: Water Pollution

EOG Question: Which of the following are indicators of a healthy water system?

a) high nitrates, high chlorophyll, low temperatureb) low temperature, high dissolved oxygen, neutral pHc) low pH, high nitrates, low dissolved oxygend) low turbidity, high chlorophyll, high

temperature

EOG Question: What does it mean when a scientist says a lake has a high turbidity?

a) the water has a lot of particles in itb) the water is very clearc) the water is very basicd) the water can support many

organisms

Let’s Practice!

Water Quality Independent Practice

Summarizer:A student takes measurements from a lake in East Charlotte. The student finds the following:

Turbidity: HighDissolved Oxygen: lowTemperature: 111 ° FahrenheitpH Level: 3.1

Is this a healthy lake or an unhealthy lake? Explain your answer in 5-7 sentences. BE SURE TO INCLUDE a prediction about what the lake looks like (Do you think there are there any bio-indicators? Do you think there could possibly be an algal bloom?)