Lake Toba is a lake vulkanik with the length of 100 kilometers and 30 kilometers wide in Sumatra, North Sumatra, Indonesia. In the middle of the lake, there is an island called vulkanik Samosir Island.Lake Toba long since become an important tourism destinations in North Sumatra, Bukit Lawang and the addition of Nias, attract domestic and foreign tourists.
Lake Toba is estimated to occur when the explosion around 73000-75000 years ago and is bursting supervolcano (super volcanoes) that most new. Bill Rose and Craig Chesner from Michigan Technological University estimate that the materials vulkanik the dimuntahkan mountain of 2800km 3, with 800km 3 rock ignimbrit and 2000km 3, which is gray vulkanik is blown away to the west for 2 weeks. Vulkanik be blown dust that the wind has spread to half the earth, from china to the south african. Letusannya occurred for 1 week and throw debunya 10 KM above sea level. This incident caused the death and mass in some species also followed extinction. According to some evidence of DNA, this eruption also menyusutkan the number of people to about 60% of the earth when the human population is around 60 million people. The explosion also caused the ice period, although experts still debate the matter. After the eruption, formed Caldera, which is then filled by the water and into the now known as Lake Toba. Pressure to the top by Magma, which has not been out resulted Island Samosir.
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