1) We cannot see the stars on a clear night sky. a) True b) False 2) Our nearest star is the Sun a) True b) False 3) Stars are balls of gases made up of mainly hydrogen and helium. a) True b) False 4) Stars are the same sizes. a) True b) False 5) Some stars are bigger than the Sun. a) True b) False 6) Water is one of our important resources. a) True b) False 7) About 20% of the Earth surface is covered by water. a) True b) False 8) Seas and oceans are surface water source. a) True b) False 9) We cannot use because of its high salt content. a) True b) False 10) Only 2.5% of the water on Earth is freshwater. a) True b) False 11) Turn on the tap when it is not in use. a) True b) False 12) Turn on the tap while brushing your teeth. a) True b) False 13) Use rainwater to wash your car. a) True b) False 14) Wash dishes in a sink full of water instead of under a running tap. a) True b) False 15) We should use water economically and do not waste. a) True b) False

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