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The give graph saw main source of energy in usa in 1980 and 1990.

The give graph saw main source of energy in usa in 1980 and 1990. JKK7E

The pie charts give information about the comparison of important sources of power for USA in the year between 1980 and 1990. The data has been calibrated in percentage. Overall, it is vividly manifested that the oil was a main source of energy in both year. While, less contribution of energy production was hydroelectric power. To begin with, in 1980, oil was a tops of the list among the all categories, it accounted for 42%. However, it was slightly decrease by 10% in next 10 year. There had been a constant contribution of hydroelectric power in both year around 5%, also it was lowest produce power compare to others. There was minor differences observed in natural gas by only 1% from 1980 to 1990. Moving towards, in the year 1980, as regards nuclear power, it comprised to 5%, and experienced a two fold rise to one tenth percentage in 1990. The coal was produced 22% energy in 1980. While, it was rose in 27% in next decade. , respectively.

The pie charts give information about the comparison of This phrase/word is too simple and can be replaced with:vitalcriticalessential
important
 sources of You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
A determiner is probably missing here: "for the USA".for the USA
for USA
 in the You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
 between 1980 and 1990. The data has been calibrated
 in percentage. Overall
, it is vividly
 manifested that the oil was a main source of energy in both You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
. While, less contribution of energy production was hydroelectric power.

To This phrase/word (depending on the context) can be potentially replaced with :initiatecommence
begin
 with, in 1980, oil was a tops of the list among the all categories, it accounted for 42%. However
, it was slightly
Consider using a past participle here: "decreased".decreased
decrease
 by 10% in next
 10 You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
. There had been a constant contribution of hydroelectric You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 in both You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
 around 5%, also
 it was A determiner is probably missing here: "the lowest".the lowest
lowest
 produce You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 compare to others. Did you mean "There were minor differences"?There were minor differences
There was minor differences
 observed in natural gas by This phrase/word (depending on the context) can be potentially replaced with :exclusively
only
 1% from 1980 to 1990. Moving towards, in the You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
 1980, as regards nuclear You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
, it comprised to 5%, and experienced a The adjective or adverb 'twofold' needs to be written as one word.twofold
two fold
 rise to one tenth percentage in 1990. The coal was produced
 22% energy in 1980. “While” at the beginning of a sentence usually requires a 2nd clause. Maybe a comma, question or exclamation mark is missing, or the sentence is incomplete and should be joined with the following sentence.
While
, it was rose in 27% in next
 decade. Loose punctuation mark.apply
,
respectively
. 