W14

Writing practice: Pie Chart

The pie charts show the main sources of energy in USA in the 1980s and the 1990s**.** The proportion of oil,natural gas and coal dominated as the top three sources in USA. In the 1980s, oil dominated 42 percent of all sources; it was the most important source for USA. However, it decreased to 33 percent after the decades. But it still dominated most of all sources. Compare to the 1980s, natural gas didn’t change too much in the 1990s .From the chart, we can see that hydroelectric power didn’t change even after many years. Nuclear power and coal, both of them increased few percent in the 1990s. The two charts were not really different from each other. From the pie charts, we can understand the main sources in USA easily and know what it changed clearly.