Uploaded by djwaleed369 on Nov 25, 2011
GEOLOGY
Kilimanjaro is composed of three distinct volcanic cones: Kibo 5,895 m (19,341 ft); Mawenzi 5,149 m (16,893 ft); and Shira 3,962 m (13,000 ft). Uhuru Peak is the highest summit on Kibo's crater rim.
Kilimanjaro is a giant stratovolcano that began forming a million years ago, when lava spilled from the Rift Valley zone. Two of its three peaks, Mawenzi and Shira, are extinct while Kibo (the highest peak) is dormant and could erupt again. The last major eruption has been dated to 360,000 years ago, while the most recent activity was recorded just 200 years ago.
Although it is dormant, Kibo has fumaroles that emit gas in the crater. Scientists concluded in 2003 that molten magma is just 400 m (1,310 ft) below the summit crater.[citation needed] Several collapses and landslides have occurred on Kibo in the past, one creating the area known as the Western Breach.
ICE:
In the late 1880s the summit of Kibo was completely covered by an ice cap with outlet glaciers cascading down the western and southern slopes, and, except for the inner cone, the entire caldera was buried. Glacier ice flowed also through the Western Breach.[31]
An examination of ice cores taken from the North Ice Field Glacier indicate that the "snows of Kilimanjaro" (aka glaciers) have a basal age of 11,700 years.[32][33] A continuous ice cap covering approximately 400 square kilometers covered the mountain during the period of maximum glaciation, extending across the summits of Kibo and Mawenzi.[34] The glacial ice survived drought conditions during a three century period beginning ~2200 BCE.[35]
The period from 1912 to present has witnessed the disappearance of more than 80% of the ice cover on Kilimanjaro. From 1912-1953 there was ~1% annual loss, while 1989-2007 saw ~2.5% annual loss. Of the ice cover still present in 2000, 26% had disappeared by 2007. While the current shrinking and thinning of Kilimanjaro's ice fields appears to be unique within its almost twelve millennium history, it is contemporaneous with widespread glacier retreat in mid-to-low latitudes across the globe. Unless trends change, Kilimanjaro is expected to become ice-free some time between 2022 and 2033.[35]
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