Nov 20 (Reuters) - The Shiveluch volcano on the Kamchatka Peninsula in the Russian Far East has become extremely active, threatening a powerful eruption, the Kamchatka Volcanic Eruption Response Team said on Sunday."A growth of the lava dome continues, a strong fumaroles activity, an incandescence of the lava dome, explosions, and hot avalanches accompanies this process," the observatory said on its website.Hot avalanches with a temperature of 1000 degrees Celsius (1,832°F) roll down the slopes, pyroclastic flows descend.Shiveluch, one of Kamchatka's largest volcanoes with a summit reaching 3,283 metres (10,771 feet) is also one of the peninsula's most active ones, with an estimated 60 substantial eruptions in the past 10,000 years.The volcano last most powerful eruption took place in 2007, according to NASA."