In the south of the US state of Alaska, in the Katmai National Park has about a hundred square kilometers of land covered with volcanic ash, called the Valley of Ten Thousand Smokes (Valley of Ten Thousand Smokes).
Starting from June 6, 1912, for three days, there was held one of the largest in the modern history of eruptions of the volcano. "Culprit" was stratovolcano Katmai, and the force of the eruption was estimated at 6 points out of eight possible. Literally shot a column of ash to a height of about 20 kilometers. It is noteworthy that as a result of the eruption formed a new volcano called Novarupta. Scientists estimate that the dust cloud visor about 10% of sunlight in the Northern Hemisphere in that year. Researchers were able to get to the valley only four years later, in 1916. Below you will see just a photo of the expedition. The heat even after this amount of time, you could quite fry bacon. To date, all the ashes cooled and stories were only mountain ash. They, incidentally, laid down on the ground about 11 cubic kilometers.