1. The lowest layer of the atmosphere is called the Troposphere b) Stratosphere c) Tropopause d) Aesthenosphere 2. Average atmospheric carbon dioxide concentrations show what trend over the period 1955 to the present? b extremely variable - no elear trend increase c) no change d) decreasing 3. Keeling's reports from Mauna Loa demonstrated. An increase in CO2 from 1950s to present b) That sediments deposited on the seafloor can yield clues about past climates. c) That as distances from cities decreases, CO2 concentrations increased. d) That CO2 levels have been stable over the last 40 years. 4. The major differences in the Keeling's curves between the one taken at Mauna Loa (Hawaii) and th taken over the South Pole (Antarctica) is because Antarctica is cooler ) Antarctica is larger There are more trees in the Northern Hemisphere d) There is no difference 5. The most recent analyses of polar ice cores have given us the ability to profile global climate cha back as far as years 750,000. b) 100,000. c) 1000. d) 50,000. . Recent evidence from polar ice core analysis shows that carbon dioxide levels have never exceed ppm in the last 400,000 years. 500 1000 c)\25 200 According to Popper the most important element of the Scientific Method is for a hypothesis t a) Accurate b) True D Refutable d) Broadly acceptable. . 8. Energy intensity is a) The ratio of the carbon footprints to the energy used. b) The ratio of carbon footprints to the GDP c) The ration of energy used to the GDP The ratio of fossil fuels used to the total energy used. 9. We can measure the atmospheric concentrations of carbon dioxide 400,000 years ago by a) Measuring the gas trapped on the surface b) Measuring the pH of the ocean Measuring the gas sealed in bubbles in a layer that can be dated to that time d) Measuring the gas in caves that can be dated to that period. 10. A 1 ton (1000kg) tree was able to be a net sequester ofk of carbon- dioxide during its lifetime a) 1467 b) 600 2000 d 147 (Assume that the tree is made of the sugar glucose-CoH 2O Use the following chemical reaction for sequestration: 6CO2 +6H 0CoH120%+ 602 The molecular weight of glucose is 180 and the molecular weight of CO2 is 44)