1. Which of the following is necessary for a substance to burn?   Oxygen   Gasoline   Light   Hydrogen   Hint Half-n-half Clue   2. Which of the following is NOT a noble gas?   Krypton   Argon   Helium   Hydrogen   Half-n-half Clue   3. A barometer is used for measuring   Temperature   Annual Rainfall   Humidity   Atmospheric Pressure   Half-n-half Clue   4. When we breathe which of the following gases do we use?   Carbon Dioxide   Hydrogen   Helium   Oxygen   Half-n-half Clue   5. Which gas in the atmosphere saves us from the UV rays of the sun?   Carbon Monoxide   Oxygen   Ozone   Nitrogen   Half-n-half Clue   6. Dry ice is   Very Cold Ice   Any Frozen Liquid   Solid Carbon Dioxide   Ice with salt added   Half-n-half Clue   7. Fish breathe through   Gills   Skin   Nose   Lungs   Half-n-half Clue