Look at the pie chart and describe it in 40 seconds.

ANSWER:- 

The pie chart is about the distribution of sources of energy. The two graphs show that oil was the major energy source in the USA in both 1980 and 1990 and that coal, natural gas, and hydroelectric power remained in much the same proportions. On the other hand, there was a dramatic rise in nuclear power, which doubled its percentage over the ten years. To conclude, we can say that the USA has started shifting from oil to nuclear power.