Who first announced his belief that the world is round? What is magma? Of what does the Earth’s inner core consist? Approximately what percentage of the Earth’s surface is water and what percentage is covered by glaciers? Why does an object weigh a little less at the Equator that at the Poles? Why does one lean forward when climbing a hill? Where and what is the ‘Ring of Fire’? Which is the world’s largest volcanic crater? Where is the North Magnetic Pole? Who was the first person to sail north of the North Magnetic Pole? What causes tides? What is tsunami? What are the ‘Horse Latitudes’? Which clouds are composed mainly of ice crystals? For what would one use a hygroscope? What is meant by an alluvial plain? What is an aurora? What is the continental shelf? What is a ‘cold desert? What is a savannah? What are the tundra areas of land? What is a watershed? What is geothermal energy? What is the second major energy source after oil? What is the ‘snowline’?

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