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100
What is a volcano?
Today, a volcano is the term for any place on the surface of the earth, where hot molten rock or magma is erupted or has been in the past
100
How dangerous are volcanoes?
Volcanoes are usually less dangerous than other natural hazards such as earthquakes, tsunamis and hurricanes.
100
Which is the world's largest volcano?
The largest volcano on earth is Mauna Loa on Hawai'i Big Island.
100
What is a supervolcano?
The term "supervolcano" implies a volcanic center that has had an eruption of magnitude 8 on the Volcano Explosivity Index (VEI), meaning the measured deposits for that eruption is greater than 1,000 cubic kilometers (240 cubic miles).
100
Do scientists know if a catastrophic eruption is currently imminent at Yellowstone?
There is no evidence that a catastrophic eruption at Yellowstone is imminent, and such events are unlikely to occur in the next few centuries.
200
What are the most active volcanoes?
Kilauea volcano on Hawaii is the world's most active volcano, followed by Etna in Italy and Piton de la Fournaise on La Réunion island.
200
What are volcanic rocks?
Volcanic rock is an igneous rock of volcanic origin.
200
Which was the world's biggest eruption?
On 10 April 1815, Tambora produced the largest eruption known on the planet during the past 10,000 years. The volcano erupted more than 50 cubic kilometers of magma and collapsed afterwards to form a 6 km wide and 1250 m deep caldera.
200
What are some other examples of supervolcanoes?
Volcanoes that produced exceedingly voluminous pyroclastic eruptions and formed large calderas in the past 2 million years would include Yellowstone, Long Valley in eastern California, Toba in Indonesia, and Taupo in New Zealand.
200
How far in advance could scientists predict an eruption of the Yellowstone volcano?
The science of forecasting a volcanic eruption has significantly advanced over the past 25 years.
300
Why are volcanoes called active even when there is no eruption?
An active volcano is a volcano that has had at least one eruption during the past 10,000 years. An active volcano might be erupting or dormant. An erupting volcano is an active volcano that is having an eruption... A dormant volcano is an active volcano that is not erupting, but supposed to erupt again. An extinct volcano has not had an eruption for at least 10,000 years and is not expected to erupt again in a comparable time scale of the future.
300
What are fumaroles?
Fumaroles are vents from which volcanic gas escapes into the atmosphere.
300
Which is the most dangerous volcano in the world?
Vesuvius volcano in the Gulf of Naples, Italy.
300
What is the chance of another catastrophic volcanic eruption at Yellowstone?
Although it is possible, scientists are not convinced that there will ever be another catastrophic eruption at Yellowstone.
300
Can you release some of the pressure at Yellowstone by drilling into the volcano?
No
400
Has worldwide volcanic activity been increasing recently?
The main difference is that there is faster and more information availabe, as well as increased media coverage and public interest on the subject of global volcanic activity.
400
How many volcanoes are there in the world?
The exact number of volcanoes is unknown.
400
How many volcanoes erupt every year?
The volcanic explosivity index is a scale from 1 to 8 to measure the magnitude (erupted volume) and intensity (eruption column height) of an eruption.
400
What would happen if a "supervolcano" eruption occurred again at Yellowstone?
: Such a giant eruption would have regional effects such as falling ash and short- term (years to decades) changes to global climate.
400
Could the Yellowstone volcano have an eruption that is not catastrophic?
Yes
500
How do you know when a volcano cannot erupt anymore?
When there are no signs of an active magma chamber beneath the volcano (no unusual seismic activity, no volcanic gasses escaping etc.), and when there hasn't been any activity for a long time span (at least 10,000 years).
500
How many volcanoes can erupt at once?
In theory, there is no limit on the number of volcanoes that could erupt at once other than the number of active volcanoes themselves: while it is thus theoretically thinkable, that all 600 volcanoes (on land) known to have had eruptions during recorded history erupt at once, this is so unlikely that it can be excluded.
500
How long do eruptions last?
It is much more difficult to predict the end of an eruption than to predict its beginning
500
Is Yellowstone monitored for volcanic activity?
yes
500
Because Yellowstone is so geologically active, are there other potential geologic hazards in Yellowstone?
The heat and geologic forces fueling the massive Yellowstone volcano affect the park in many ways.