Clicker Questions: Midterm 2 1. CO2 in the atmosphere today is approximately…385ppm (parts per million)2. Nitrous oxide forms from…combustion or burning of oxygen in a nitrogen-rich atmosphere3. Which of the air pollutants is photochemical in origin? Ozone4. An inversion layer occurs…when cold air underlies warm air5. The most powerful greenhouse gases are…CO2 and methane (CH4)6. The most significant early nationwide US legislation to curb air pollution was in the…1970s7. If the front of a glacier is observed to be receding, it is most correct that the glacier is…moving more slowly than it melts8. Wind-deposited glacial flour from great dust storms at the edge of glaciers is termed… loess9. A pyramidal-shaped mountain peak sculpted by glaciers is called…a horn10. Landform characteristics of valley glaciers include…all of the above-horns arêtes and cirques-hanging valleys, moraines and great scenery-U-shaped valleys, lateral moraines and arêtes-cirques and fjords 11. Water-deposited glacial deposits occur in…eskers, kettles and outwash plains 12. A bajada is a dry lake bed in the desert: False 13. The coastal Atacama Desert of Chile, one of the world’s driest, has its moisture taken by the Andes: True 14. Flat erosion surface formed by running water at the edges of retreating desert mountains is termed desert pavement: False 15. The steep side of a sand dune or ripple mark is on the upwind side: False 16. Sub-tropical deserts occur along equatorial latitudes: False 17. Desert regions of Earth are increasing today: True 18. Rainshadow deserts form downwind from mountains: True 19. Sand accumulated on the North side of a groin indicates that the direction of longshore drift is to the North: False 20. Ocean waves that have a long wavelength will generate surf farther from shore than those with a short wavelength: True 21. Marine terraces, such as those of Palos Verdes, are an indication of uplift or lowering of sea level: True 22. Sea stacks represent erosional remnants following sea cliff retreat: True 23. Ocean waves are caused by…wind 24. Waves that are oblique to a shoreline…all of the above -tend to bend parallel with the shoreline -generate longshore currents -lead to the formation of rip currents 25. Characteristics of an uplifted coastline include…sea cliffs, marine terraces and sea stacks 26. Hurricanes…grow in intensity with warm water27. Some clay minerals expand in the process of water creating unstable land surfaces: True28. Pedocal soils are enriched in aluminum and iron: False 29. Clay minerals form by the process of…hydrolysis30. Irrigation leads to…salts 31. A poorly developed soil horizon will occur on which type of bedrock? All of the above (shale and siltstone, mica schist, quartzite,