1) How many continents are there on Earth? a) 7 (Asia, Africa, North American, South America, Europe, Australia, Antarctica) b) 6 (Asia, Africa, North American, South America) Europe, Australia, 2) How many oceans are there on Earth? a) 5 (Arctic, Atlantic, Indian, Pacific, South Oceans) b) 5 (Arctic, Atlantic, Indian, Pacific,  Southern Oceans) 3) How many moon orbit Earth? a) 1 b) 2 c) 3 d) 4 4) Which gas is essential for life on Earth? a) Oxygen (O2) b) Nitrogen (N2) c) Carbon dioxide (CO2) d) Helium (He) e) Argon (Ar) f) All are correct 5) Which planet has conditions similar to those on Earth? a) Venus b) Mars

Magic Library - U10 Planet Earth

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