Tham khảo tài liệu 'ielts reading and writing part 5', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | swirling like a whirligig around the continent. says MacAyeal. That prevents them from wandering into major shipping lanes farther north. But B - 15 might cause trouble closer to home. These giant icebergs last for decades without melting and during those decades they travel thousands of miles says MacAyeal The only problem is that their travel is undirected. In the back of my head there s an inkling of a possibility that we might learn enough about icebergs to someday direct one up to be Angeles. An iceberg the size of B - 15 would supply the city s water needs for 500 years. So far MacAyeal doesn t see any evidence that global wanning is affecting the Ross Ice Shelf and its calving but other researchers report that the ice sheet appeals to be thinning in peripheral parts of Antarctica. More definitive information may be available in a few years after MacAyeal poets automated weather stations and seismic sensors on the shelf. c- In September 2000 for the second tune in less than a year a massive iceberg splintered away from the Roes Ice Shelf in Antarctica. The new iceberg which scientists dubbed C - 16 measures 30 miles long by miles wide some 345 square miles in area. It was detected by satellite on September 27 though the exact date of cleavage is unknown due to the extensive cloud cover that has persisted over the southern Ross Sea. Iceberg C - 16 is being tracked by the National Ice Center a Maryland - based agency staffed by members of the . Navy the . Coast Guard and the National Oceanic and Atmospheric Administration. The new iceberg poses some cause for concern for resupply ships serving the . Antarctic research station on Roas Island. This one is of particular interest because of its proximity to Roas Island which is where McMurdo Station is located Butcher said. It s possible that this iceberg may drift enough to impact the area where the ships will be operating so we re going to be monitoring this one very closely through the season. The
