<p> Notes Sect 5-1 </p><p>Weathering</p><p>What are the two types of weathering?</p><p>A. Mechanical Weathering</p><p>1. What is mechanical weathering (KEY)?</p><p>2. Why does mechanical weathering increase the rate of chemical weathering? (see also Fig 2)</p><p>3. (a) Describe the process of frost wedging?</p><p>(b) Where is it more common? Why?</p><p>(c) What is talus?</p><p>4. (a) What is unloading?</p><p>(b) What is exfoliation?</p><p>(c) What kinds of structures are often formed by unloading? (Figure 4) 5. (a) How might a tree cause mechanical weathering?</p><p>(b) List some ways humans enhance mechanical weathering:</p><p>B. Chemical Weathering</p><p>6. What is chemical weathering? (key)</p><p>7. ______is the most important agent of erosion.</p><p>8. What gas becomes dissolved in water that helps enhance chemical weathering?______</p><p>9. What kind of minerals form when oxygen dissolved in water reacts?</p><p>10. What causes the yellow to reddish-brown coating on iron rich minerals?</p><p>11. What forms when water absorbs carbon dioxide (CO2) from the atmosphere or from decaying organic matter in the soil?</p><p>12. What does carbonic acid do to many minerals (especially carbonate minerals)? 13. Water in atmosphere can also dissolve sulfur oxides and nitrogen oxides (ex: SO2 and NO2) which when dissolved form acids that enhance chemical weathering. List some sources of these gases to the atmosphere</p><p>14. The chemical weathering of granite leads to the formation of ______minerals. These minerals are [tiny; large], so they can be carried far from shore by rivers entering the ocean.</p><p>C. Rate of Weathering</p><p>15. What are the two factors that affect how fast rock weathers?(key)</p><p>16. Why is the number of cracks in rock important to weathering?</p><p>17. Why are marble gravestones more susceptible to weathering than granite gravestones?</p><p>18. What are the two factors of climate that are most closely related to weathering?</p><p>19. The climate most favorable to chemical weathering has ______and ______. </p><p>20. Chemical weathering is [fast; slow] in both desert and polar regions.</p>