Environmental Science

User Generated

obaavrxvat

Science

Description

1.

What is BPA? How might you get exposed to BPA?

2.

Name and describe each of the four major types of environmental hazards.

3.

Describe three reasons contagious diseases often claim more lives in developing nations than non-contagious disease.

4.

Differentiate between an LD50 and an ED50 response to toxicity. Explain why there is a response threshold to some toxins.

5.

Explain how scientists identify and assess risks.

6.

Thoroughly describe the “Precautionary Principle” policy. Do you agree with this policy? Explain.

7.

Using your own words, describe the three types of possible tectonic plate boundaries. Why do so many earthquakes and volcanos occur along the “ring of fire” circum-pacific belt?

8.

Thoroughly describe the rock cycle.

9.

What is a mineral? Why is it important that items that use minerals be recycled?

10.

Describe two types of mining. What are the effects of each on the environment?

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Explanation & Answer

Bonnie, do not worry. I was very much aware and here you go,

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1

1. Bisphenol A and human exposure
Bisphenol A (BPA), also known as carboxylic acid, is a synthetic chemical compound
that is used in the manufacturing of certain forms of plastic that are used to line food cans which
are relatively hard, clear polycarbonate with epoxy resins. It is produced in the United States in
large quantities of approximately 2.3 billion pounds yearly (Schierow, 2011).
Individuals get exposed to bisphenol A primarily when they consume food and beverages
that are contaminated by polycarbonate bottles and food and beverage cans coated with epoxy
resins. Moreover, medical devices and other ubiquitous products such as thermal paper coatings
may cause exposure (Schierow, 2011).
2. Major types of environmental hazards
Environmental hazards include physical hazards, biological hazards, cultural hazards and
chemical hazards according to Perritano 2010.


Physical hazards occur naturally in the environment and include harmful ultraviolet
radiations from the sun, hurricanes and tornadoes, floods and droughts, earthquakes and
volcanic eruptions, and landslides.



Biological hazards emanate from ecological interactions among organisms including
viruses and bacterial infections that cause diseases.



Cultural hazards are related to individual lifestyles such as diet and nutrition, physical
activities and exercises, cigarette smoking and drug abuse, and energy inefficient
technologies such as fuel guzzler vehicles.



Chemical hazards include disinfectants, plastics, and pesticides that have effects on the
ecosystems including persistent organic pollutants and dichlorodiphenyltrichloroethane.
2

3. Reasons why contagious diseases often claim more lives in developing nations than
the non-contagious disease.
Poverty
Developing nations are relatively poor and cannot easily afford medications to infectious
diseases such as malaria, HIV/AIDS, and diarrhea. They greatly depend on external aids to fight
against infectious diseases. Poverty also triggers migration of elite doctors to search for greener
pasture...


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