Mount Kilimanjaro is one of the largest stratovolcanoes in the world. Otherwise known as a composite volcano, it comprises numerous layers of lava, tephra and volcanic ash. Tephra is rhyolitic (an igneous, extrusive rock) in composition, and is formed by air-fall material of an eruption, which suggests the composite volcano was once active. However, at the moment it is dormant. According to experts there have been no eruptions in living memory, which suggests it has been dormant for millions of years.

Mount Kilimanjaro is in the shape of a conical volcano; it is formed by ejecta being thrown up by the volcano vent, which then piles around the vent in the shape of a cone. Due to the fact that Mount Kilimanjaro is made up of tephra, it has a cinder cone. This is because the mountains cone is made up of tephra cinders. They are made up of blobs of congealed lava and particles. When the mountain did erupt millions of years ago, the gas-charged lava would be blown violently into the air, then breaking the smaller fragments which would solidify and fall as cinders. This left Mount Kilimanjaro with a bowl-shaped crater. Moreover, as Mount Kilimanjaro is a stratovolcanoe then they can have explosive eruptions. The lava from the mountain is viscous (it’

s a measure of the thickness of a fluid which is deformed by shear stress or extensional stress) which cools down before it spreads very far, which explains the mountains small crater. The rock on the mountain is felsic and has high levels of silica (in this case tephra). It is also in alternating sectors, with lava flows and ejecta in different formations. This is called stratum, which is usually formed by natural forces i.e. volcanic eruptions from Mount Kilimanjaro.

The volcano is the highest in Africa reaching 5,895m high. It also covers an area of 388, 500ha. Although the volcano stands alone, it is a part of an east-west belt of volcanoes stretching over Northern Tanzania. It has three main concentric cones to the southeast in the mountain, but also has smaller parasitic cones. Also known as a satellite cone, the main vent is blocked by cooled solidified lava, and the lava is then forced out through the sides of a volcano under immense pressure. To the west side of the mountain is the peak Shira (3,962m), of which only the southern and western rims remain.

Best way to see Mount Kilimanjaro

Kilimanjaro has several official climbing routes. These are:

• Machame
• Marangu
• Rongai
• Londorossi Lemosho
• Umbwe
• Shira
• Mweka (descent only)

Best way to experience Mount Kilimanjaro

The climb to Uhuru Peak is considered to be a relatively straightforward endeavour; however, ample time must still be provided for proper acclimatization to prevent altitude sickness. The three shortest routes, Marangu, Rongai and Machame are less challenging and are often climbed by individuals with limited mountaineering experience. Many climbers employ altitude-sickness medication, including acetazolamide.

An ascent of Mawenzi requires rock climbing and/or snow/

ice climbing skills.

Route travel times range from 5 to 9 days to summit and return to the base of the mountain. Huts with cooking facilities, bathrooms, and electricity are available on the Marangu route, and camps with less facilities are available on many other routes. All huts and many camps have rangers stationed at them with rescue facilities (modified wheelbarrows to transport climbers stricken with altitude sickness to lower altitudes).

Summit attempts are generally undertaken at night, because the scree is frozen together, making the climb significantly easier. Climbers on the Marangu route first encounter Gilman's Point on the rim of the crater, which is roughly a 1½

hour hike from Uhuru. Another route is the Western Breach, much more technical in nature and attempted by serious mountaineers. Annually, approximately 15,000 people attempt to climb the mountain, of whom 40% reach the summit.

The rapidly retreating Furtwä

ngler Glacier is near the summit.

At the summit, there is a sign posted by the Tanzanian government. The sign (printed in English only) reads "Congratulations! You are now at Uhuru Peak, Tanzania, 5,895 m. AMSL. Africa's Highest Point. World's Highest Free-Standing Mountain. One of World's Largest Volcanos. Welcome." The sign is covered in travel stickers from past trekkers who have left their mark on the top of the peak. Near this famous sign is a box containing a log that many climbers have signed. As of January 2007 this box has either been removed or buried.