<p>Chapter 15 Practice Multiple choice At a ______, plates slide past one another as they move in opposite directions.</p><p> a. divergent plate boundary </p><p> b. convergent plate boundary </p><p> c. transform fault </p><p> d. subduction zone Which of the following causes physical or mechanical weathering?</p><p> a. frost wedging </p><p> b. lichen </p><p> c. roots </p><p> d. carbon dioxide Which of the following classifications of mineral resources describes mineral deposits known to exist in a certain place, quantity, and quality?</p><p> a. identified resources </p><p> b. reserves </p><p> c. undiscovered resources </p><p> d. extractable reserves Which of the following is not considered to be a mineral resource?</p><p> a. coal </p><p> b. sand </p><p> c. barium </p><p> d. aluminum In the United States, about 90% of the mineral resources are extracted by</p><p> a. surface mining. </p><p> b. subsurface mining. </p><p> c. mountaintop removal. </p><p> d. open-pit mining. Which of the following is not a result of extracting, processing, and using mineral resources?</p><p> a. large amounts of solid waste </p><p> b. soil buildup </p><p> c. increase in water pollution </p><p> d. disturbance of land The ______depletion time assumes no recycling or reuse of a mineral and no increase in reserves.</p><p> a. shortest </p><p> b. longest Which of the following is a possible environmental effect of seabed mining?</p><p> a. It can affect the salinity of the water in the area being mined. </p><p> b. It may change the ocean temperature. </p><p> c. It can stir up ocean sediments. </p><p> d. It will affect migrating patterns of whales. Some analysts believe that even if supplies of key minerals become too expensive or scarce from unsustainable use, human ingenuity will find</p><p> a. new technologies for mining and extraction. </p><p> b. better methods of recycling minerals. c. substitutes for scarce minerals. </p><p> d. new deposits of scarce minerals. Answers C A A C A B A C C</p>