We know that hurricanes form above warm ocean water. And it's thought that warmer water can lead to stronger hurricanes. The Earth warmed one degree Fahrenheit over the 20th Century. Warming is causing sea surface temperatures to climb. Has the warming climate had an impact on hurricanes? This is an area of active research. One way that scientists are trying to answer this question is by looking at the history of hurricanes. The graph below on the left shows the total number of hurricanes that happened in each region during three time periods. The graph on the right shows the number of very strong hurricanes that happened over the same three time periods. Total Number of Hurricanes Number of Strong Hurricanes (Category 4 and 5 storms) 250 200 50 150 40 d...1!ו 100 30 20 50 10 East Pacific West Pacific North Soutwestern North Indian South Indian East Pacific West Pacific Ocean North Soutwestern North Indian South Indian Pacific Ocean Осеan Atlantic Pacific Осеan Осean Ocean Atlantic Ocean Ocean 1971-1985 1986-2000 2001-2016 1971-1985 1986-2000 2001-2016 a. Has the total number of hurricanes increased, decreased, or stayed about the same? b. Is the trend the same for all regions? c. Has the number of strong (cat. 4 and 5) storms increased, decreased, or stayed about the same? d Is this trend tho Number of Hurricanes

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