1. Which of the following is a main component of common glass?   Marble   Powdered Mica   Sand   Water   Hint Half-n-half Clue   2. The surface of earth is mainly covered with   Ice   Oceans   Land   Mountains   Half-n-half Clue   3. Natural hot water springs occurring in New Zealand, Italy and Iceland are known as   Old Faithfuls   Fountains   Hot Bubbles   Geysers   Half-n-half Clue   4. What are metal bearing rocks called?   Ores   Bitumen   Slag   Metalloids   Half-n-half Clue   5. The length of the days and nights is equal at the   Equator   Tropic of Capricorn   South Pole   North Pole   Half-n-half Clue   6. Stalactites and stalagmites consist of deposits of   Calcium Carbonate   Magnesium Carbonate   Silica   Sodium Bicarbonate   Half-n-half Clue   7. Seismograph is the instrument used for recording earthquake shocks.   True   False