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What causes volcanoes?

How do volcanoes affect us?
How often do volcanoes erupt?
What is the biggest volcano
eruption ever?
100
How are volcanoes formed?
Magma rises to earth's surface.
100
Do volcanoes affect people in bad ways, good ways, or both?
Volcanoes affect people in both ways.
100
How many years is it between any volcano erupting from another?
There is no way of telling.
100
When and where was the most recent volcano eruption?
Japan, 2014
200
How do volcanoes explode?
When pressure is released, as a result of plate movement, magma explodes from the surface, resulting in a volcanic eruption.
200
If ash fall is heavy, it will
make you unable to breathe.
200
Where in the USA do volcanoes explode?
The west coast
200
What was the name of the volcano that holds the record for the largest eruption, and when did it happen?
Mt. Tambora, 1815
300
How do volcanoes take shape?
Lava from an eruption cools to create new crust. Over time, after several eruptions, the rock builds up and a volcano forms.
300
What is one good way that volcanoes affect people?
Spectacular scenery or fertile soil.
300
How many average years is it between the same volcano erupting?
200-300 average years.
300
How many miles away could Mt. Tambora's eruption be heard?
1,200
400
Volcanic eruptions can cause:(answer one of these)
earthquakes,fast floods, mudslides, or rock falls.
400
How many people died during the eruption of Mt. Tambora?
71,000 people.
500
What ranking did Mt. Tambora's eruption get?
7 on the Volcanic Explositivity Index