Lesson 3 - Hydro Environment

Question 1

Name the 9 types of pollution.

Answer 1

1. Coarse physical degradation
2. Organic material
3. Eutrophic substances
4. Mineral salts
5. Non–mixing substances
6. Heat
7. Settleable and colloidal substances
8. Pathogenic organisms
9. Heavy metals

Question 2

Considering pollution:

What is Coarse physical degradation?

Answer 2

Papers, cans, etc.

Visual pollution.

Question 3

Considering pollution:

What is Organic material?

Answer 3

Sewage (untreated)
→ increased 02 demand
→ If demand > 02 from the atmosphere - aerobic organisms die off

Question 4

Considering pollution:

What are eutrophic substances?

Answer 4

Three water body categories based on ability to support autotrophic growth, namely:

1. Oligotrophic
   – low N+P levels (cannot support high autotrophic population)
2. Mesotrophic – moderate N+P concentrations
3. Eutrophic – high N+P concentrations high algae growth, appears green anaerobic conditions when algae die off

Sewage & agriculture largest contributors

Question 5

Considering pollution:

What are Mineral salts?

Answer 5

sewage, industrial, rocks

Question 6

Considering pollution:

Name a non-mixing substance.

Answer 6

Oil

Question 7

Considering pollution:

How does heat pollution affect the environment?

Answer 7

With temperature rise the 02 solution reduces.

Question 8

Considering pollution:

Why do heavy metals pose a problem for the environment?

Answer 8

Not really soluble, but accumulative