Following a volcanic eruption, which event is usually the last one to be observed

the last thing to bee observed is the damage

Explanation:

A volcanic event occurs when there is a sudden or continuing release of ... (1) an eruptive pulse (essentially an explosion with an eruption plume, but also ... events like caldera collapse, or long erosional intervals, and may last 10 m.y. or more ... where a certain type of behavior was first observed or most commonly occurs.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation: