1) Mineral water comes from: a) sea. b) Guandú river. c) fountains. 2) The distance from the Sun to the Earth guarantees: a) water in solid state on Earth. b) water in liquid state on Earth. c) water in gaseous state on Earth. 3) In big cities, rain water is not drinkable because... a) water is clean. b) water has pollutants and can be acid. c) water is mineral. 4) For a water filter is needed: a) coal, sand and rocks. b) coal, rocks and filter. c) sand, clay and rocks. 5) Pollutes water: a) animals. b) plants. c) humankind.

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