21. Is natural spring water safe to drink

22. What type of rock is found in caves and cave formation?

23. What type of rock makes a good aquifer?

24. What is not a solution to the freshwater shortage on Earth

25. What percentage of Earth is covered with water

26. What percentage of Earth’s water is trapped in icecaps

27. What percentage of Earth’s water is available for drinking

28. What percentage of Earth’s water is salt water

29. What is not a glacier feature

30. What is a feature of a young river

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