The island of Bali, like most of the islands of the Indonesian archipelago, is the result of the tectonic subduction of the Indo-Australian plate under the Eurasian plate. The tertiary ocean floor, made of ancient marine deposits including accumulation of coral reefs, was lifted above the sea level by the subduction. Layers of Tertiary limestone lifted from the ocean floor are still visible in areas such as the Bukit peninsula with the huge limestone cliffs of Uluwatu, or in the northwest of the island at Prapat Agung.[1]
The local deformation of the Eurasian plate created by the subduction has encouraged the fissuring of the crust, leading to the appearance of volcanic phenomena. A string of volcanoes line the northern part of the island, in West-East axis along which the western part is oldest, and the eastern part newest.[1] The highest volcano is the active strato-volcano Mount Agung, at 3,142 m (10,308 ft).
Volcanic activity has been intense through the ages, and most of the surface of the island (outside of the Bukit Peninsula and Prapat Agung) has been covered by volcanic magma. Some old deposits remain (older than 1 million years), while most of the central part of the island is covered by young volcanic deposits (less than 1 million years), with some very recent lava fields in the northeast due to the catastrophic eruption of Mount Agung in 1963.[1]
Volcanic activity, due to the thick deposits of ashes and the soil fertility it generates, has also been a strong factor in the agricultural prosperity of the island.[1]
At the edge of the subduction, Bali is also at the edge of the continental Sunda shelf, just west of the Wallace line, and was at time connected to the neighbouring island of Java, particularly during the lowering of the sea level in the Ice Ages. Its fauna and flora are therefore Asian.[2]
Source of Content: http://en.wikipedia.org/wiki/History_of_Bali
Source of Picture: Indonesian-n-south-african-friendship
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