Each world, as well as any inhabitants, experience their own form of evolution. Volcanic eruptions and earthquakes are part of a cleansing process in the evolution of the material world. Those who are killed in earthquakes are at a particular stage where they are ready for death, because of what has happened in their past lives. Those in the spirit world do not view any death as a disaster, but rather, a great hour of freedom for the soul.
There are other worlds, or planets, inhabited by similar beings most of whom are in advance of our world of matter. The planet Hedes (Hay-deez) is the only planet less spiritually advanced than Earth!