Answer to Question 1
Answer: D
Answer to Question 2
Answer: Much of Earth's surface is occupied by large continental ice sheets and floating sea ice. If the atmosphere were to cool along the margins of these ice masses, there could be an expansion of the ice-covered area. Similarly, any warming would likely lead to melting and a retreat of the ice margin. Because ice has a higher albedo than most other natural surfaces, an expansion of the ice would lead to a reduction in the amount of insolation absorbed by the surface, which in turn would lead to further cooling (a positive feedback). Likewise, a retreat of the ice associated with a warming climate would increase the amount of surface no longer covered by the reflective ice and, therefore, lead to enhanced warming. Thus, a positive feedback mechanism is at work that favors continued warming or cooling once such a temperature trend is initiated. It is largely for this reason that middle and high latitudes show larger changes than low latitudes.
Areas of Mediterranean shrubland in southern California periodically burn over large areas, destroyi
Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen
Southern rockhopper penguin
Formation of the Early Earth
Lateral view of right cerebral hemisphere