20 points! < is what I chose. How did I do? 1. The atmosphere on Planet A is about 90% carbon dioxide. The atmosphere on Planet B is about 50% carbon dioxide. Which planet has a higher surface temperature and why? Planet A has a higher surface temperature due to the higher amount of carbon dioxide in the atmosphere < Planet A has a lower surface temperature due to the higher amount of carbon dioxide in the atmosphere Planet B has a higher surface temperature due to the lower amount of carbon dioxide in the atmosphere 2. Methane is the main constituent of natural gas. Choose all the following ways humans contribute to increasing methane gas: Leaks from natural gas systems Rotting organic matter in wetlands < Raising cattle < 3. Pollutants come from: natural sources human activities both natural sources and human activities. < 4. A substance is produced by the combustion of fuels in automobiles. Once in the atmosphere, this substance combine with water to form acid precipitation. What is this substance? Carbon Dioxide Nitrogen oxide Sulfur Dioxide < 5. Why do nitrogen and oxygen atmospheric gases NOT contribute to the greenhouse effect? They are made up of 3 atom molecules that are bound tightly so they CANNOT vibrate to absorb energy. They are made up of 3 atom molecules that are bound tightly so they CAN vibrate to absorb energy. < They are made up of 2 atom molecules that are bound tightly so they CANNOT vibrate to absorb energy. They are made up of 2 atom molecules that are bound tightly so they CAN vibrate to absorb energy. 6. How do greenhouse gases contribute to global warming? They reflect infrared energy that reaches Earth's surface and absorb the energy in all directions. This keeps the infrared energy close to the Earth's surface. < They absorb infrared energy that reflects off Earth's surface and reemit the energy in all directions. This keeps the infrared energy close to the Earth's surface. They reflect infrared energy that reaches Earth's surface and absorb the energy in all directions. This keeps the infrared energy away from the Earth's surface. 7. Most of the greenhouse gases produced come from which sources? (Check all that apply) Chlorofluorocarbons (CFC) and Hydrofluorocarbons (HFC) from aerosols, cleaning agents, and refrigeration Fracking < Methane from rotting plant and animal matter < Solar energy production Burning fossil fuels in factories, ships, cars, trains < Cutting down forests How did I do?