Study Guide for Unit 4 lanjutan

Study Guide for Unit 4 lanjutan - Study Guide for Unit#4 1...

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Study Guide for Unit #4 1.) Since the 1950’s China has planted over 300 million trees in what has come to be called “The Great Green Wall of China.” What is the purpose of this tree barrier? a) Reduce desertification of the Gobi desert. b) Prevent severe dust storms from reaching Beijing. c) Preserve the fertility of China’s soils. d) All of the above 2.) Conserving our soil resources is critical to human survival because approximately _____ percent of our food comes from the land. a) 99% 3.) Although natural climate conditions are responsible for forming deserts, human activities such as _____ and _____ have caused deserts to expand. a) Deforestation b) Overgrazing e) Only A and B 4.) Soil forms by weathering of rock. Which of the following is a process through which rock is weathered? 5.) How does the topography of an area impact the soil composition of that area? c) Runoff from precipitation tends to amplify erosion on steep surfaces 6.) Soil is composed of four distinct parts. What are these four components? 7.) Approximately ___ percent of soil composition is solid material (like minerals and organic matter) and ___ percent is air and water. c) 50 : 50 8.) The mineral portion of soil comes from ______, where as the organic portion comes from _______. c) weathered rock : dead and decaying organisms 9.) Which of the following affects soil composition? 10.) What is humus? a) Organic matter bound to nutrient mineral ions and water b) Dark brown or black soil rich in nutrient minerals c) Decomposed organic matter which supports decomposers, such as earthworms and ants d) All of the above 11.) Water that is not absorbed by plant roots will _____ nutrients from the soil and carry the nutrients downward through percolation. a) leach 12.) _______ of leached minerals occurs at the B-horizon, where the clay and nutrients minerals accumulate. b) Illuviation 13.) Two environmental concerns that are associated with soil erosion are ____ and ____.
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14.) Soil salination is most common in arid and semiarid regions. What is the primary cause of soil salination? b) irrigation
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  • Spring '11
  • KatherineMedina
  • genetically modified, genetically modified crops, Organic matter, soil erosion, Roundup Ready Soybeans

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