1. Chlorine is added to drinking water to kill microbes that cause illness. This is known as   Chlorination   Elimination   Microbe Termination   Vaporization   Hint Half-n-half Clue   2. Conversion of water into water vapor is known as   Vaporization   Boiling   Freezing   Condensation   Half-n-half Clue   3. What is formed when hydrogen burns in oxygen?   Water   Carbon Dioxide   Hydrogen Peroxide   Carbon Monoxide   Half-n-half Clue   4. What falls to the ground when clouds become too heavy?   Rain (Raindrops)   Lightning   Thunder   Mineral Salts   Half-n-half Clue   5. Earth is known as the blue planet because of the presence of   Water   Atmosphere   The continents   Sky   Half-n-half Clue   6. What is the melting point of ice?   0 oC   12 oC   32 oC   100 oC   Half-n-half Clue   7. Water exerts pressure on the walls and the bottom of the container in which it is placed.   True   False