Mount Longonot is not extinct. It is considered dormant, meaning it has not erupted recently but is still capable of doing so.

Here's why:

* Recent Activity: While its last major eruption was around 1860, there have been smaller eruptions and fumarolic activity (release of steam and gases) in more recent times.

* Geological Structure: Mount Longonot has a distinct volcanic cone and caldera, indicating its volcanic nature.

* Seismic Activity: There have been recorded seismic events around the volcano, suggesting potential magma movement.

Therefore, Mount Longonot is classified as a dormant volcano, not an extinct one.