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Envs 121: Environmental Systems Y1s2 Question Paper

Envs 121: Environmental Systems Y1s2 

Course:Bachelor Of Environmental Science

Institution: Kabarak University question papers

Exam Year:2010



INSTRUCTIONS:
 ANSWER ALL QUESTIONS IN SECTION A AND ANY TWO IN SECTION B

SECTION A (40 MARKS)
1. (a) Describe with aid of a well labelled diagram, the structure of the earth. (4 marks)
(b) Describe the types and characteristics of plate boundaries. (6 marks)
2. (a) Illustrate with aid of a well labelled diagram, the trend of temperature from
troposphere to thermosphere. (6 marks)
(b) Explain what causes plate tectonics movement. (4 marks)
3. (a) Describe the effects of man’s activities on water cycle. (4 marks)
(b) Explain the role played by oceans on carbon cycle. (6 marks)
4. (a) Describe the uses of chlorofluorocarbons. (4 marks)
(b) Explain how CFCs cause ozone layer depletion. (6 marks)

SECTION B (20 MARKS)
5. Describe the various sources of greenhouse gases that cause global warming.
(10 marks)
6. Discuss the effects of ozone layer depletion on human health, food crops, forests
and wildlife. (10 marks)
7. Discuss the effects of human activities on nitrogen cycle. (10 marks)




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