Which of the following is a Negative Feedback in the Earth System? Group of answer choices Additional Water Vapor Feedback Melting of Ice Feedback Chemical Weathering Feedback Additional Fire Feedback Flag question: Question 2 Question 2 2 pts The gas mostly responsible for Ozone depletion is: Group of answer choices Cholorofluorocarbons (CFC's) Nitrous Oxide Carbon Dioxide Methane Flag question: Question 3 Question 3 2 pts Why is it unlikely that sunspot activity is the reason for Earth's warming? Group of answer choices There is little correlation between sunspot activity and earth's temperature Sunspot activity can only account for 0.03°C of temperature variability All of these are true If Sunspots were the main cause, Earth's average temperature would rise and fall with sunspot activity Flag question: Question 4 Question 4 2 pts The Ozone hole is present over Antarctica during which months of the year? Group of answer choices September and October June and July December and January March and April Flag question: Question 5 Question 5 2 pts Which of the following is a possible cause for Stratospheric Cooling Group of answer choices Greenhouse Gasses trapping heat in the Troposphere All but a decrease in Earth's Albedo A decrease in Earth's Albedo Ozone Depletion in the Stratosphere Flag question: Question 6 Question 6 2 pts Which of the following aerosols is believed to have a warming effect? Group of answer choices Black Carbon Sea Salt Sulfur Dioxide Dust Flag question: Question 7 Question 7 2 pts Forcings on Earth's temperature that occur OUTSIDE of the Earth-Atmosphere system (such as Sunspots) are called _________________________. Group of answer choices External Forcings Internal Forcings The Forcing (from Star Wars (TM)) Negative Forcings Flag question: Question 8 Question 8 2 pts Why can't most natural forcings account for recent warming? Group of answer choices Because Al Gore Said So! Because the warming we've seen is too minor for it to be caused naturally They either take too long (like the Milankovitch Cycles), or have too small an impact (like sunspots) Because climate does NOT change naturally Flag question: Question 9 Question 9 2 pts For the purpose of feedback mechanisms discussed in our class, what was the "initial disturbance"? Group of answer choices The professor's head being kicked down a hill Earth Warming The Sun Dimming Massive Solar Flares Flag question: Question 10 Question 10 2 pts Consider the following feedback loop: Your blood sugar increases => Your pancreas excretes insulin into your blood stream => The insulin removes sugar from your blood => Your blood sugar decreases. This is an example of what kind of feedback loop? Group of answer choices Neutran Feedback Loop Negative Feedback Loop This is not a feedback loop. Positive Feedback Loop Flag question: Question 11 Question 11 5 pts Section 2: Written Question. Please answer the question below, in complete sentences, not using any text lingo or shorthand (such as b/c or w/o). Compare and Contrast the direct effects of aerosols to the indirect effects of aerosols.

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