... portion of the stratosphere, from approximately 20 to 30 kilometers above Earth, though the thickness varies seasonally and geographically. The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobson meter) that could be used to measure stratospheric ozone ... ate the plants. So the succession has evolved, via several evolutionary paths, through herbivorous and carnivorous dinosaurs, mammals and omnivorous ...

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• Grade Level: Undergraduate