1) How old is earth? a) 4.5 billion years b) 6.7 billion years c) 10.5 billion years 2) How many continents are there? Can you name them? a) 6 b) 7 c) 9 3) How many countries are there in the world? a) 123 b) 146 c) 195 4) Which continent has the most countries? a) Africa b) Europe c) Asia 5) What is the population of the world? a) 5.9 billion b) 6.9 billion c) 7.9 billion 6) Which country has the largest population? a) India b) China c) USA 7) What proportion of the earth is covered by water? a) 61% b) 71% c) 81% 8) How much of the earth's land surface is used to grow food? a) 14% b) 21% c) 40% 9) Which is the world's largest island? a) Greenland b) Iceland c) Madagascar 10) What is the world's largest desert? a) Gobi Desert b) The Sahara c) Syrian Desert

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