1. Water: True or False

2. Is rain water the purest form of water? Is fresh water more acidic than salt water? Test how deep your water knowledge by diving into this quiz. 3. At 10 meters below, the atmospheric pressure of the ocean is exactly double of that of the surface.TRUEFALSE 4. Back to QuestionYou need more practice! 5. Great catch! You answered True! At 33 feet (10 meters) below the surface, the pressure is twice that of the surface. Most divers must use an oxygen tank, though some can hold their breath and swim to that depth 6. ScoringNEXT 7. Roughly 20 percent of the water humans use is for agriculture. TRUEFALSE 8. Back to QuestionYou need more practice! 9. Great Catch! You answered False! More than 70 percent of the water used by humans each year goes to agricultural purposes. This includes raising animals as well as plants. 10. ScoringNEXT 11. Rain water is the purest form of water. TRUEFALSE 12. Back to QuestionYou need more practice! 13. Great Catch! You answered False! Rainwater contains small amounts of dissolved minerals, as well as particles of dust and dissolved gases. Distilled water is the purest form 14. ScoringNEXT 15. Fresh water is more acidic than salt water. TRUEFALSE 16. Back to QuestionYou need more practice! 17. Great Catch! You answered True! Fresh water has a pH of 7, which is in the middle of being acidic and alkaline. Seawater is more alkaline, with a pH of about 8. 18. ScoringNEXT 19. The ice that covers the Antarctic is more than 4,000 meters thick TRUEFALSE 20. Back to QuestionYou need more practice! 21. Great Catch! You answered TRUE! Many portions of the Antarctic ice sheet are nearly 16,400 feet (5,000 meters) thick, including some that extend far below sea level. 22. ScoringNEXT 23. Water boils more quickly in the mountains than at sea level. TRUEFALSE 24. Back to QuestionYou need more practice! 25. Great Catch! You answered True! The boiling point of water gets lower as you go up in altitude. At beach level, water boils at 212 F (100 C). At 9,843 feet (3,000 meters), it boils at 194 F (90 C). 26. ScoringNEXT 27. Water contracts when it freezes. TRUEFALSE 28. Back to QuestionYou need more practice! 29. Great Catch! You answered FALSE! Water expands when it freezes. Ice, the solid form of that liquid, is one of the few items that floats as a solid. 30. ScoringNEXT 31. Condensation is water that comes from the air. TRUEFALSE 32. Back to QuestionYou need more practice! 33. Great Catch! You answered True! Water that forms on the outside of a cold glass or on the inside of a window in winter is liquid water condensing from water vapor in the air. In cold air, water vapor condenses faster than it evaporates. 34. ScoringNEXT 35. Water is composed of hydrogen and helium atoms. TRUEFALSE 36. Back to QuestionYou need more practice! 37. Great Catch! You answered False! A water molecule comprises two hydrogen and one oxygen atoms. We express this by saying "aitch-two-oh. 38. ScoringNEXT 39. It is impossible to tell time by water. TRUEFALSE 40. Back to QuestionYou need more practice! 41. Great Catch! You answered False! Some of the most ancient timepieces are water clocks. These release water at a regular rate that allows a viewer to gauge time by how much water is left. 42. ScoringNEXT 43. *** END *** Thanks for playing!Play again?