Up to how many kilometres above the surface does the atmosphere extend?
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3
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about 250 km above the surface of earth
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Earth's atmosphere is about 300 miles (480 kilometers) thick, but most of it is within 10 miles (16 km) the surface. Air pressure decreases with altitude. At sea level, air pressure is about 14.7 pounds per square inch (1 kilogram per square centimeter).
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