Answer:
31 miles
Step-by-step explanation:
The bottom of the stratosphere is around 10 km (6.2 miles or about 33,000 feet) above the ground at middle latitudes. The top of the stratosphere occurs at an altitude of 50 km (31 miles).
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The answer in scientific notation is 1 * 10 to the 15 power.
The result is 1,000,000,000,000,000.
In word form its one quadrillion.