No. Question Page 



31. What causes the tides? 33 



32. Why do tide ranges in the same geographical areas of the 

 world differ so greatly? 34 



33. What are seamounts? How are they created? 35 



34. How deep in the ocean can one see with natural sunlight? . 36 



35. What is the volunne of the world's oceans? 37 



36. Are whales found in all oceans of the world? 38 



37. Do any creatures in the sea other than the porpoise talk?. . 39 



38. How do oysters produce pearls? 40 



39. How far into the ocean can one "see" the effect of a 

 river? 41 



40. Is seaweed a weed? What is it and how does it grow? .... 43 



41 . What is green scum? 45 



42. What are algae? 46 



43. Can gold, silver, platinum, or diamonds be mined from 



the sea? 48 



44. Where is the hottest ocean or portion of an ocean? 49 



45. How salty are the oceans? Which is the saltiest? 50 



46. Has a sea gull, albatross, or other sea bird ever flown 

 across the ocean? 51 



47. Are there volcanoes under the sea like those on land? .... 52 



48. Is life found at all depths in the ocean? 53 



49. What causes "tidal waves"? 55 



50. Can "tidal" waves be forecast? 58 



51. What is the "bends" and how do divers become afflicted 



with it? 59 



52. Are all fishes edible? 60 



53. What other sea life is used for human consumption? 61 



54. What is fish protein and why is it important? 63 



55. What is "fish farming" and where is it practiced? 64 



56. How far has a message in a bottle ever traveled on the 

 ocean? 65 



57. What is the difference between hydrography and oceanog- 

 raphy? 67 



58. How old is the science of oceanography? 68 



59. What universities and colleges have oceanographic courses? 70 



60. Who hires oceanographers? 72 



61. What is the largest oceanographic research ship? 73 



62. How are oceanographic observations taken beside from a 



ship? 74 



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