There were many signs that Mount Vesuvuis
was going to erupt. Earthquake activity increased signaling
that the volcano was coming back to life. None of the
Romans saw any of the signs. The winds also changed that
day. If the wind hadn't changed Pompeii wouldn't have been
destroyed, and the lava would have flown into the sea.
Most of Pompeii's victims were most probably killed by the roof collapsing. If they were outside the slate roof would have came off and killed them before the lava did. They were also killed by the gas, or by choking on ash from the volcano. Bodies were covered in hot ash and enveloped by volcanic material. When scientists found the skeletons they filled the gaps with plaster of paris so people can relive and see how they looked when the disaster happened.
Pompeii's volcano erupted in 79AD.