Write your answers in the spaces provided. Where calculations are required, clearly show how you arrived at your answer. Where explanation or discussion is required, support your answers with relevant information and/or specific examples. Electricity can be produced from a variety of fuels and methods. (a) Although producing electricity from burning fossil fuels, such as in coal-fired power plants, is common around the world, some scientists and economists argue that where the geography is appropriate, hydroelectric power is a better method for generating electricity. (i) Describe one advantage of using hydroelectric power plants over using coal-fired power plants. (ii) Describe one potential disadvantage of hydroelectric power plants.