Primary succession is when there isn't any soil when a new community begins.
Secondary succession is when an event such as a fire destroys an area but leaves the soil.
Primary succession would transition to secondary succession by starting off without any soil. Overtime the community would begin to grow and then soil would appear and plants would start to grow. It would then change to Secondary succession whn an event destroys that area leaving just the soil behind.
Primary succession is ecological succession that begins in essentially lifeless areas, such as regions in which there is no soil or where the soil is incapable of sustaining life (because of recent lava flows, newly formed sand dunes, or rocks left from a retreating glacier).
