The two main graphs show the main sources of energy in the USA in 1980 and 1990.

The two pie charts provide information about the USA’s main

source

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of

power

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from 1980 to 1990.

Overall

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, Oil made up the largest

source

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of

energy

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in the USA,

while

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hydroelectric

power

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and nuclear

power

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were the least in the 10-year period.

However

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, Oil and natural gas experienced a decrease,

whereas

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coal and nuclear

power

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increased. In 1980, the major

source

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of

energy

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was oil accounting for 42%,

nevertheless

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, it fell significantly to 33% in 1990, but it stayed the main

source

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of

energy

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for the United States.

In addition

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, Natural gas made up 26% of the

energy

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sources at the beginning of the period, and it dropped to 25% in 1990. Whilst, hydroelectric

power

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remained constant throughout the period at 5%.

On the other hand

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, coal made up less than one quarter as an origin of

energy

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in 1980, but it rose by 5% in 1990 making it the second main

source

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of

energy

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in the USA reaching 27%.

Although

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nuclear

power

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was one of the least

energy

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sources in 1980, it experienced a rise to 10%

at the end

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of the given year.