This is why they are often around volcanoes or volcanic areas.
Some of the triggered sites were within geothermal or volcanic areas.
The very young volcanic area near Olot probably has a similar cause.
These themes range from a volcanic area to a frozen area.
In some cases can andosols also be found outside active volcanic areas.
Note that hot springs in volcanic areas are often at or near the boiling point.
This geologic feature is one of earth's great active volcanic areas.
They concentrate heavily around the volcanic area of the peaks.
The vast majority live way in the interior, which is mostly swamp and jungle with some volcanic areas.
This explains the often irregular dating achieved in volcanic areas.