The top of Earth\'s atmosphere is found at approximately 120 km (75 miles) above

Question

The top of Earth's atmosphere is found at approximately 120 km (75 miles) above sea level. At what height would you find half of the mass of the atmosphere below you and half of the mass of the atmosphere above you? Select one: a ~ 5 km b. ~ 30 km c. ~ 60 km d. ~ 75 km e. This height is impossible to identify because Earth's atmosphere is uniform in density. Examine the list of gases below. Which gas, if removed from the atmosphere, would cause Earth's temperature to decrease dramatically? Select one: a. Hydrogen b. Ozone c. Water Vapor d. Argon e. Removing any of the above gases will not cause a change in the Earth's temperature since they are in such low concentration in Earth's atmosphere.

Explanation / Answer

Answer to first Question

Answer: a. approximately 5 km

The top of the earth atmosphere is found at approximately 120 km above sea level. At 5km height you can find half of the mass of the atmosphere below you and half of the mass of the atmosphere above you. This is 99% atmospheric mass has been concentrated within 32 km from earth surface due to gravity, so within 5km gravitational effect is very high, so we can find half mass of atmosphere within 5km.

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