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| | Great Rift Valley -- Britannica Student Encyclopedia (Site not responding. Last check: 2007-10-21) |
 | | The longest rift on the Earth's surface, the Great Rift Valley is a long, deep depression with steep, wall-like cliffs, extending from Jordan in southwestern Asia southward through Africa to Mozambique. |
 | | The rift has a total distance of approximately 4,000 miles (6,400 kilometers) and an average width of 30 to 40 miles (50 to 65 kilometers). |
 | | Includes information on the geographic distribution of Rift Valley fever, transmission of the disease to humans, populations who are most at risk, symptoms, treatment, permanent vision loss associated with the disease, and preventive measures. |
| www.britannica.com /ebi/article-9274642 (791 words) |
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