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

in the United States in two different years.

Overall

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

energy

.

According to

what is shown, in 1990, the majority of

power

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

However

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

energy

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

energy

came from nuclear

power

, at 10 per cent and from hydroelectric

power

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

power

, at 42 per cent,

whereas

the usage of both nuclear

power

and hydroelectric

power

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

power

, at 22%, and 26%, respectively.

To sum up

, we could say that, in 1990,

although

the consumption of oil reduced as a source of

energy

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

power

production.