Visually similar to nuclear mushroom clouds, eruption columns are massive plumes of hot ash produced during explosive volcanic eruptions. In extreme cases, eruption columns may rise over 25 miles (40 km), penetrating the stratosphere and causing short-term climate change, like the drop in global temperature that followed the 1991 eruption of Mount Pinatubo. It is believed that the largest eruptions can cause up to several degrees of global cooling and may be responsible for what phenomena? Discuss
Source: The Free Dictionary