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What is a ‘dobson unit’?
It is the total weight of trace gases in air column.
It is the measure of the columnar density of ozone.
It is the measure of adequate dissolved oxygen required for respiration of aquatic organisms.
It is the energy measurement of UV-rays entering the atmosphere through the Ozone layer.
Dobson unit discovered by Gordon Dobson is also known as Total Ozone or Column Abundance. It is a unit to identify the thickness of column of the gas around earth. Hence, answer is B.
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