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15
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Which gas is essential for life on Earth?
1. Oxygen (O2), medical use, 2. Nitrogen (N2): fire suppression, provides an inert atmosphere 3. Helium (He): balloons, medical equipment 4. Argon (Ar): welding
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15
×
How many oceans are there on Earth?
5 (Arctic, Atlantic, Indian, Pacific, and Southern)
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15
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Which planet has conditions similar to those on Earth?
Mars
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15
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How many continents are there on Earth ?
7 (Asia, Africa, North America, South America, Europe, Australia and Antarctica)
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lifesaver
Give 25 points!
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fairy
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5
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25
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rocket
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thief
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5
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15
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25
15
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How many moons orbit Earth?
1
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