As soon as the magma thickens and builds up with the gases of planet can create explosions and cause lava to flow upwards and have ash released into the air causing thick clouds of smoke often seen overhead volcanoes.
When there is a volcanic eruption, there could be many other dangers which occur.  These things can be such as flash floods, mudflows, landslides and rock falls, and even earthquakes. These are simple plans but if you do live in an area very close to an active volcano, they could end up saving your life and your family’s. You might not realize or understand that a volcano is active or is about to erupt either, however, when a volcanic eruption occurs, you have to be vigilant.  You have to be aware of what could happen and how a volcano works.
It might sound as though volcanoes aren’t that dangerous if they haven’t been active for years but they’re still dangerous.  They have intense heat from lava flows and of course the acid rain can all become dangerous. Enormous volcanic eruptions more than 100 times the size of ordinary volcanic eruptions like Mount St. Geologists generally believe that a super-eruption is produced by a giant pool of magma that forms a couple of miles below the surface and then simmers for 100,000 to 200,000 years before erupting.

They developed four independent lines of evidence that agreed that the formation process took less than 10,000 years and most likely between 500 to 3,000 years before the eruption. It makes good headlines to print, but in reality we would only find out about it when the sky goes black.
However, there was no great scale eruption.  Lava flowed but didn’t reach the town, this was a very small eruption compared to many others.
If there is an increased magma but a decrease of planet gases, then the eruption will not be as great. But a new study suggests that once they form, these giant magma bodies may only exist for a few thousand years, perhaps only a few hundred years, before erupting.
They determined crystallization rates of quartz – the most abundant mineral in the deposits – to gather information about the lifespan of these giant magma bodies.
The simmering volcano has produced major eruptions—each a thousand times more powerful than Mount St.

After they form, however, crystals and bubbles form gradually and progressively change the magma's physical and chemical properties, a process that halts when an eruption takes place.
Zircons are commonplace in volcanic rocks and they contain small amounts of radioactive uranium and thorium, which decay into lead at a set rate, allowing scientists to accurately determine when the crystals formed. Apparently, a “pancake-shaped blob” of molten rock the size of Los Angeles was pressed in to the slumbering volcano, some six miles down. The supervolcano has recently caused miles of ground to rise dramatically, scientists report beginning in 2004, which saw the ground above the caldera rise upward at rates as high as 2.8 inches (7 centimeters) a year.

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