The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The pie chart illustrates the differences of the main sources of energy in the USA between the 1980s and 1990s. Overall, the sources of energy that increased in utilization are comprised of nuclear power and coal, while both oil and natural gas experienced a major decrease in 1990. Meanwhile, hydroelectric power remained constant based on […]

The pie charts illustrate the principal sources of electricity production for USA in 1980 and 1990. Overall, there was a decrease in the percentage of natural gas and oil, while the opposite was true for coal and nuclear energy. Additionally, hydroelectric energy maintained the same level in the second level. In 1980, oil beame the […]