41. Because of the shallowing ocean bottom , water pushed ashore piles up, causing an abnormal rise in ocean level. 42. Researchers have found similar microbes living in other remote places _ polar caps, ocean bottoms and mountain tops. 43. The environmental group Greenpeace urged on Tuesday that the Kursk be pulled off the ocean bottom if possible. 44. Surveys of the ocean bottom found freshly collapsed sediment that slid nearly a mile down a 25-degree slope. 45. He developed the technique of using explosive charges to determine the type of ocean bottom sediments and their thickness. 46. But after fish die and fall to the ocean bottom , the molecular structure of the teeth begins to change. 47. Spassky said, adding, " I cannot conceive that such an object could be left on the ocean bottom ." 48. Her tasks included making accurate profile studies of the ocean bottom for the purpose of evaluating new sonar devices. 49. That massive event involved a huge section of ocean bottom being pushed under the land mass of South America. 50. Exploration of the ocean bottom in the last fifty years revealed manganese nodules and phosphate nodules in many locations.
