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The Yellowstone caldera is not "overdue" for an eruption. You may have heard that the Yellowstone Caldera erupts regularly every 600,000 years and the last major eruption was 640,000 years ago. In reality the caldera does not erupt regularly and as gone as long as 800,000 years without a major eruption.
Yellowstone has a approx. 650,000 year-old cycle, and so the last major eruption was about 650,000 years ago. Therefore, the next eruption is long overdue and a major volcanic eruption is expected to occur in this century. It may be late 21st century (2070+), mid-21st century (2040+) or early 21st century (i.e. now or in the next two decades). Basically, Yellowstone will erupt that is a guarantee. Anyone guessing December 21, 2012?
Yellowstone's huge magma chamber underground is a boiling river continually building for a major eruption. Scientists estimate the huge eruption will be so great that it could destroy most of the North American continent.
The Yellowstone volcano is about 2.1 million years old. It's first major eruption dates to that time. The volcano is the latest in a series that formed from the same hot spot starting about 16 million years ago.
It is a a landform.
Most scientists believe that Yellowstone is not truly active and that they would be able to detect if the Yellowstone volcano was going to erupt years before it erupted. But there is no way to no for sure if the Yellowstone caldera is truly active (building up for an eruption).
The Yellowstone volcano is not just a volcano - it is a supervolcano. Geologists maintain there have been no eruptions for tens of thousands of years. It is constantly releasing pressure, although it appears the ground levels due to the movement of magma have risen several centimetres in the last century. However, despite scientists believing that a major eruption is well overdue, it currently shows no signs of an imminent major eruption.
The Mount Helen's 1980 eruption was a major volcanic eruption.
No there is not a period of time in Florida when you can return a new car. A car may be returned if it has a major mechanical defect under the Lemon law.
The last major eruption of mt.vesuvius was in 1994.
An major eruption
1944 it was the last major eruption from vesuvius