1. A typical point source of pollution would be

a) your yard, after it is fertilized
b) the overland runoff from a specific road
c) an outfall pipe from a sewage treatment plant
d) the runoff from a specific part of your city or county

2. Although many, perhaps most, metals are poisonous to living things, some are required in minute amounts. A good example is iron, which you require because it is

a) important in keeping your liver healthy
b) the center of the hemoglobin molecule in red blood cells
c) important in digestion
d) an ingredient in many health foods

3. Sewage treatment plants are important sources of _______ in estuaries

a) heavy metals like copper and zinc
b) overland runoff
c) siltation
d) nitrates and phosphates

4. Cows are big animals. A big one may weigh a half-ton or more. So how much does an average cow excrete each day in the form of cow splats?

a) 80 pounds
b) 40 pounds
c) 160 pounds
d) I don't really want to know!

5. Which of the following major cities is not built on an estuary? You may have to use a map for this one.

a) Mobile, Alabama
b) Denver, Colorado
c) Portland, Maine
d) Seattle, Washington

6. The concept of half-life is important in figuring out how long a pollutant will remain a pollutant in the environment. That same concept is used to determine how long a radioactive element will continue to be dangerous to living things. An example often used is the element Plutonium, a by-product of nuclear weapons which mimics calcium in the manufacture of bone in animals - meaning that once exposed to it, an animal will receive constant doses of gamma radiation until it dies. Plutonium is a major worry of all who understand how it works. The half-life of Plutonium is 25,000 years. This means that it will remain dangerous to living things for

a) 25,000 years
b) 250,000 years
c) 2,500,000 years
d) not enough information is given to answer this question

  Need to Review......Lesson 7 Article 

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