Re: sinkholes schema

A sinkhole is a topographical feature, like a glacial valley.

The formation of a specific sinkhole is an event. Usually faster than the
formation of a glacial valley (check for ice giants).

The sink hole formation event may be the cause of other events (a car
falling event), a road closing event, an emergency response event.
It may bring about a state of affairs (an emergency situation, a road being
closed).

It may also have no affect on humanity (if a sinkhole forms in a forest and
there is no one there to fall in to it).

Simon