Note that oxygen gas is O₂ while ozone is O₃.

1			Which of the following prevents most of the dangerous ultraviolet radiation from reaching the earth?
			A)	Oxygen gas
			B)	Carbon dioxide gas
			C)	Water vapor
			D)	Ozone
			E)	Nitrogen
2			Suppose you blow up a balloon on top of a mountain, tie it off, and then throw it down into the valley below. The balloon's volume will
			A)	increase.
			B)	decrease.
			C)	stay the same.
3			If you were to draw a 1 inch by 1 inch square on a piece of paper on your desk, estimate the weight of the column of air that sits directly above the square.
			A)	About one ounce
			B)	About one pound
			C)	About 15 pounds
			D)	About 100 pounds
4			When the humidity is high outside
			A)	the water vapor in the air deposits on your skin helping you to feel cool.
			B)	sweat evaporates from your skin making you feel warmer.
			C)	the water vapor in the air prevents sweat from evaporating from your skin making you feel warmer.
			D)	None of these is correct.
5			What happens to relative humidity as air temperature decreases?
			A)	It decreases.
			B)	It increases.
			C)	It stays the same.
6			When wind hits the side of a mountain, the terrain pushes the air upward. As it moves up the mountain, the air
			A)	gets cooler.
			B)	gets warmer.
			C)	keeps the same temperature.
7			When you park your car in the sun,
			A)	infrared and visible light from the sun pass through the windshield and warm up the car, which produces trapped ultraviolet light.
			B)	ultraviolet and visible light from the sun pass through the windshield and warm up the car, which produces trapped infrared light.
			C)	the air inside is the same temperature as the air outside.
8			Summertime in St. Louis is warmer than wintertime because in the summertime
			A)	the earth is closer to the sun.
			B)	the earth is farther from the sun.
			C)	the earth's North Pole is tilted toward the sun.
			D)	the earth's North Pole is tilted away from the sun.
9			You stand near a lake on a summer evening. The water in the lake is still warm from being heated throughout the day while the ground has already cooled significantly. Which way will the wind blow if these are the only factors affecting air movement?
			A)	The wind blows inward from the lake to the shore.
			B)	The wind blows outward from the shore to the lake.
			C)	The wind doesn't blow at all.
10			What causes a jet stream?
			A)	Warmer air at the equator and cooler air at the poles
			B)	The rotation of the earth
			C)	Lower air pressure at high altitudes and bigger pressure at low altitudes
			D)	All of these are correct.
			E)	None of these is correct.
11			What is a "front?"
			A)	When a mass of warm air meets a mass of cool air
			B)	When a mass of cool air meets a mass of warm air
			C)	Both of these are correct.
			D)	Neither of these is correct.