Discussion
Consider the following statement(s) related to the ocean acidification.
(I) It is a term used to describe the changes in the chemistry of the World's seas, primarily as a result of burning fossil fuels.
(II) The CO2 in the water, which leads to the formation of carbonic acid, has caused the pH of surface oceans to fall by 0.1 units, and it is projected to fall a further 0.3 - 0.4 pH units by the end of the century.
Select the correct code :
Answer: C
Both statements are correct, so the answer is Both (I) and (II).
Statement (I) is the standard definition: ocean acidification describes the change in sea water chemistry caused mainly by the uptake of carbon dioxide released by burning fossil fuels.
Statement (II) gives the chemistry and the figures: dissolved CO2 forms carbonic acid, which has lowered the average pH of surface oceans by about 0.1 units since pre-industrial times, and projections under high-emission scenarios give a further fall of 0.3 to 0.4 units by 2100. Since both hold, the options choosing only one or neither are wrong.
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