View Historical Volcanic Activity in a Region
Using "Volcano" entities, it is possible to explore data about eruptions of a particular volcano.
Using FilteredEntityClass, you can find all known volcanoes with eruptions in the last five years.
Find the countries each volcano is in.
Using that data, you can find all the volcanoes in a particular country or countries.
Then you can compute the number of volcanoes in each country.
Repeat those same steps to show volcanoes from a list of countries that have erupted within a recent period of time.
Show volcanoes in the "Ring of Fire" that have erupted in the last 25 years.