Environmental+Science+Revision


 * Environmental Science Unit 3 Exam Practice**

The average temperature at the earth's surface level is determined by the greenhouse effect, both natural and enhanced. This temperature has varied considerably over thousands of years. For each of the changes i-iii below you should: - identify the likely effect on surface temperature on earth and - explain how this change occurs in terms of the mechanism of the greenhouse effect. Where relevant your explanation should include reference to the different types of radiation (ultraviolet, visible, infrared) and their interaction with the atmosphere. i. A decrease in the sun's energy output Temperature would be (bold correct answer) LOWER UNCHANGED HIGHER Explanation: //Insert response here//

ii An increase in carbon dioxide concentration in the atmosphere Temperature would be (bold correct answer) LOWER UNCHANGED HIGHER Explanation: //Insert response here//

iii A decrease in the ozone layer in the stratosphere Temperature would be (bold correct answer) LOWER UNCHANGED HIGHER Explanation: //Insert response here//

Explain the difference between the **natural** and **enhanced** greenhouse effects. (2 marks) //Insert response here//

Explain the impact of the **enhanced** greenhouse effect on life on earth. //Insert response here//