Strategies for Landing an Oracle DBA Job as a Fresher
3/16/12
1. 3/16 A/B Day
LEQ: 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 pollutant
5. What is one thing you can do to help keep our
hydrosphere clean?
2. 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!
8. How are dissolved oxygen and water
temperature related?
Temperature: Dissolved Oxygen:
20° 9 mg/l
Dissolved 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
9. Good or Bad Water Quality?
Good
Dissolved Oxygen
Still Pretty
Good
TERRIBLE!
Water Temperature
12. 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?
13. What is likely the cause of the low oxygen levels in July?
a) High temperatures
b) Lots of algae died
c) More fish are being born
d) Fewer bubbles are in the water
14. Draw this in your notes:
pH Scale: scale from 0-14 that measures
the levels of acids and bases in a liquid
29. 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?
35. 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
41. Break down the word:
What do you think a
bio-indicator is?
42. Draw this in your notes:
Bio-indicators: animals that are used
to measure the health of water
Example: Trout can only live in healthy water
Trout in water = healthy No Trout in water = unhealthy
43. ADD this to your notes:
Good Water Bad Water
Quality Quality
Presence of bio-
indicators
No bio-indicator
45. EOG Question:
Which of the following are indicators of a healthy
water 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
46. 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 it
b) the water is very clear
c) the water is very basic
d) the water can support many
organisms
48. Summarizer:
A student takes measurements from a lake in East
Charlotte. The student finds the following:
Turbidity: High
Dissolved Oxygen: low
Temperature: 111 ° Fahrenheit
pH 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?)
