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

of

power

from 1980 to 1990.

Overall

, Oil made up the largest

source

of

energy

in the USA,

while

hydroelectric

power

and nuclear

power

were the least in the 10-year period.

However

, Oil and natural gas experienced a decrease,

whereas

coal and nuclear

power

increased. In 1980, the major

source

of

energy

was oil accounting for 42%,

nevertheless

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

source

of

energy

for the United States.

In addition

, Natural gas made up 26% of the

energy

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

power

remained constant throughout the period at 5%.

On the other hand

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

energy

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

source

of

energy

in the USA reaching 27%.

Although

nuclear

power

was one of the least

energy

sources in 1980, it experienced a rise to 10%

at the end

of the given year.