1) how many percent of water is a human being a) 90% b) 40% c) 70% d) 50% 2) how many liters of water should be drunk per day a) 5 litres b) 2 litres c) 0,5 litres d) 3 litres 3) chemical formula of water a) CO2 b) OH c) 2OH d) H2O 4) how many percent of water is made up of earth a) 70% b) 90% c) 60% d) 80% 5) how much water a person wastes per day on average a) 100 litres b) 30 litres c) 150 litres d) 70 litres 6) at what temperature the water freezes a) -1° b) 1° c) 0° 7) the largest ocean a) Atlantic Ocean b) Pacific Ocean c) Arctic Ocean d) Indian Ocean 8) the sea in the center of europe a) Baltic Sea b) Mediterranean Sea 9) the longest river in europe a) Dniester b) Vistula c) Danube d) Volga

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