S-290 COMPREHENSIVE EXAM SCRIPT
2026 FULL QUESTIONS AND CORRECT
ANSWERS
◉Nitrogen occupies ________ and oxygen about ________ of the total
volume of dry gases in the troposphere. Answer: Nitrogen 78%
oxygen 21%
◉atmospheric pressure is _______ at higher elevations and _______ at
lower elevations. Answer: Lower at high elevations
Higher at lower elevations
◉Half of all water vapor is found within the lowest 3miles of the
atmosphere
True or false. Answer: True
◉Under a clear sky, a dry air mass_________ the rate in which
temperatures cool off at night. Answer: Increases
◉There is _________ water vapor in polar regions than tropical
regions. Answer: There is LESS water vapor in polar than tropical
2026 FULL QUESTIONS AND CORRECT
ANSWERS
◉Nitrogen occupies ________ and oxygen about ________ of the total
volume of dry gases in the troposphere. Answer: Nitrogen 78%
oxygen 21%
◉atmospheric pressure is _______ at higher elevations and _______ at
lower elevations. Answer: Lower at high elevations
Higher at lower elevations
◉Half of all water vapor is found within the lowest 3miles of the
atmosphere
True or false. Answer: True
◉Under a clear sky, a dry air mass_________ the rate in which
temperatures cool off at night. Answer: Increases
◉There is _________ water vapor in polar regions than tropical
regions. Answer: There is LESS water vapor in polar than tropical