Alaska
alone is home to 8 percent of the world's active volcanoes, and
about 80 percent of all active volcanoes within the United States.
More than 100 volcanoes and volcano fields have been active here
within the past 1.5 million years, although only 40 have been active
during recorded time. |
 |
|
With so many volcanoes, you must be wondering how scientists keep track of them without visiting every single one. |
