A. To enforce the Farm Bill B. To improve water resources on grasslands C. To keep grasslands In their condition and not allow frees and invosive species, alter the land D. To conserve soils for agricultural production 20. Why do temperate grasslands have the most fertile soil on earth? A. Trees require substantial amounts of nutrients to grow, so the lock of trees in grassland areas allows for more fertile soil grasslands B. Temperate grasslands receive the most rainfall compared to other C. Grass roots decaying below the surface enriches the soil with nutrients D. Grasslands have the least number of invasive species who absorb nutrients from the soil 21. How much of the earth's land surface is covered with grasslands? A. 10 to 19 percent B. 20 to 30 percent C. 20 to 40 percent D. 40 to 45 percent 22.Which of the following is NOT a main threat which plagues grasslands today? A. Urbanization B. Climate change C. Unsustainable agriculture D. Lasting effects from Dust Bowl 23. Which of the following best describes the Farm Bill? A. Special tax farmers must pay each year which goes towards conservation B. Incentives provided to landowners to conserve grassland habitats C. Contract which states farmers and ranchers who own a certain amount of land must provide the government with proof they are utilizing conservation practices D. Enables federal government to fund grazing programs to improve and manage rangelands 24. Select all the services grasslands provide. A. Build deep and rich soils B. Store carbon dioxide from the atmosphere C. Filter runoff from precipitation D. Provide very important habitat for wildlife 25. Where are savannas typically found? A. Africa, Australia and South America B. Higher altitudes C. South of the Tropic of Capricorn D. Europe and North America