a social appointment or date arranged, usually by a third person, between two people who have not met. 2. either of the participants in such an arrangement. Origin of blind date. 1920-1925.
1 Mount Teide is currently a dormant volcano, but many scientists believe it will erupt again in the near future. 2  In the mid seventeenth century a group of Englishmen were the first Europeans to reach the summit of Mount Teide. The most recent eruption of Mount Teide happened in 1909. 2  It also erupted in 1798, 1706, 1705 and 1704. 3  On his voyage of discovery Christopher Columbus apparently saw the 1492 eruption of Mount Teide when he was sailing past Tenerife.
As the magma rises, the pressure is reduced, allowing the magma gas to rise as well. This equals out the pressure between the lower and upper chambers. This rise of gas pressure is an indicator that an eruption is about to occur. Any volcano that has the possibility of erupting, but is currently showing no signs is called a dormant volcano. There are some volcanoes that are no longer dormant; these are called extinct because they have been cut off from the source of their magma. For an extinct volcano to become active again a new source of magma would have to break through to the same vent or exit point. Not all eruptions are giant or horribly destructive. A number of the volcanoes in Hawaii erupt constantly and put out long slow moving trails of lava that move only a few feet a year.