1. A space that contains no air or any gas is known as   Vacuum   Bubble   Pressurized Cabin   Hollow   Hint Half-n-half Clue   2. Which of the following is not a constituent of the atmosphere?   Aluminum   Oxygen   Nitrogen   Carbon Dioxide   Half-n-half Clue   3. The lower, dense region of the atmosphere is known as   Hydrosphere   Troposphere   Stratosphere   Ionosphere   Half-n-half Clue   4. A barometer is used for measuring   Humidity   Atmospheric Pressure   Temperature   Annual Rainfall   Half-n-half Clue   5. Air is a   Plasma   Liquid   Gas   Solid   Half-n-half Clue   6. Fish breathe through   Nose   Skin   Lungs   Gills   Half-n-half Clue   7. Dry ice is   Solid Carbon Dioxide   Very Cold Ice   Ice with salt added   Any Frozen Liquid   Half-n-half Clue