ASK THE GLOBE

From: The Boston Globe (Boston, MA) | Date: August 21, 1997 | Copyright information

Q. How high is Earth's atmosphere? J.N., Boston A. The outer limit, or exosphere, gradually reaches into the vacuum of space around 435 miles above the earth's surface. The first 40 to 50 miles of atmosphere above the earth contain 99 percent of the total mass of the atmosphere and are generally of a uniform composition except for a high concentration of ozone, known as the ozone layer, 30 miles up. Calculated according to their relative volumes, the gaseous constitutents of the atmosphere are nitrogen (some 78.09 percent), oxygen (20.95 percent), argon ...

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