the two main graphs show the main sources of energy in the USA in 1980 and 1990. Write a report describing the changes, at least 150 words.

These pie charts depict the essential sources of

power

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in the United States in two different years.

Overall

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, it can be seen that there were five different ways, which could be used to generate

energy

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.

According to

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what is shown, in 1990, the majority of

power

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was produced from oil, as it accounted for a third of the whole production.

However

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, coal and natural gas together represented more than half of the total amount of

energy

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, at,27%, and 25%, respectively, the minority of

energy

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came from nuclear

power

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, at 10 per cent and from hydroelectric

power

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, at 5%. Regarding, 1980, oil was used significantly to generate

power

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, at 42 per cent,

whereas

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the usage of both nuclear

power

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and hydroelectric

power

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was very modest at the same ratio, 5. But, coal and natural gas together were in charge of the second source of

power

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, at 22%, and 26%, respectively.

To sum up

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, we could say that, in 1990,

although

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the consumption of oil reduced as a source of

energy

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by 9% in comparison to 1980, it remained the backbone of

power

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production.