The closest volcano to Kansas is Cerro Negro in Nicaragua. While it seems far away, it's actually the nearest active volcano to Kansas due to the continental drift.

Here's why:

* Plate Tectonics: Kansas sits on the North American Plate, far from any active plate boundaries.

* Volcanic Zones: Volcanoes are typically found along plate boundaries where magma rises to the surface.

* Distance: The closest active volcanic zone to Kansas is the Central American Volcanic Arc, which includes Cerro Negro.

* Continental Drift: While Kansas is currently far from Cerro Negro, the North American Plate is moving westward, meaning the distance between the two will eventually decrease.

Therefore, while Cerro Negro is quite a distance from Kansas, it's technically the closest active volcano.