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Preview questions
1. What is the chemical formula of water?
H2O · CO2 · O2 · H2
2. Which state of water is formed when it freezes?
Liquid · Gas · Solid · Plasma
3. What process turns liquid water into vapor?
Condensation · Evaporation · Precipitation · Transpiration
4. What is the main source of water on Earth?
Rivers · Lakes · Oceans · Glaciers
5. What do we call water that is found underground?
Surface water · Groundwater · Rainwater · Saltwater
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