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The graphs below show the size of the ozone hole over Antarctica and the production of three ozone-damaging gases from 1980 to 2000.

The graphs below show the size of the ozone hole over Antarctica and the production of three ozone-damaging gases from 1980 to 2000. y2Kd

The given line graphs illustrate the changes in the Ozone hole size over the Antarctica region and the amount of three gases produced which caused damage to the ozone layer from 1980 to 2000. The ozone hole was at its smallest size of about 400 thousand square kilometres in 1980, but 20 years later, it grew drastically to 3. 6 million square kilometres. It increased by nine times. The only period when there was a reduction in the size was in the early 1990s (from 2 to 1. 2 million square km). In 1980, about 70 million tonnes of CFC–11 was produced, which remained stable for 3 years before undergoing a steady decline to below 10 million tonnes in the late 1990s. The production of CFC–12, on the other hand, showed an upward trend throughout the 20-year period from 25 to 50 million tonnes, surpassing the production of CFC–11 in 1989. N2O, however, was not produced until 1990, but its production grew rapidly to about 40 million tonnes by the year 2000. Overall, the two graphs indicate that it was mainly CFC–12 and N2O, which gave rise to the expansion of ozone hole over Antarctica in the last two decades of the 20th century.

The This phrase/word (depending on the context) can be potentially replaced with :accorded
given
 line graphs illustrate the This phrase/word (depending on the context) can be potentially replaced with :altersadjusts
changes
 in the Ozone hole size over the Antarctica region and the amount of three gases produced which caused damage to the ozone layer from 1980 to 2000.

The ozone hole was at its smallest size of about 400 thousand square Possible spelling mistake. 'kilometres' is British English.kilometers
kilometres
 in 1980, This phrase/word is too simple and can be replaced with:on the contrary
but
 20 years later, it grew drastically
 to 3. 6 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 square Possible spelling mistake. 'kilometres' is British English.kilometers
kilometres
. It increased by nine times. The This phrase/word (depending on the context) can be potentially replaced with :exclusively
only
 period when there was a reduction in the size was in the early 1990s (from 2 to 1. 2 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 square km).

In 1980, about 70 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 tonnes of CFC–11 was produced
, which remained stable for 3 years This phrase/word is too simple and can be replaced with:previouslyprior to
before
 undergoing a steady decline to below 10 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 tonnes in the late 1990s. The production of CFC–12, on the other hand
, This phrase/word (depending on the context) can be potentially replaced with :demonstratedportrayedindicateddisplayed
showed
 an upward trend throughout the You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
20-year
 period from 25 to 50 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 tonnes, surpassing the production of CFC–11 in 1989. N2O, however
, was not produced until 1990, This phrase/word is too simple and can be replaced with:on the contrary
but
 its production grew rapidly
 to about 40 You use this word too often, consider replacing it withthousandtrillionmuchlottotalsum
million
 tonnes by the You use this word too often, consider replacing it withperiodbreadthtermmileagespandiameter
year
 2000.

Overall
, the two graphs indicate that it was mainly
 CFC–12 and N2O, which gave rise to the expansion of ozone hole over Antarctica in the last two decades of the 20th century. 