Primary succession is one of the two types of biological and ecological succession. It is the establishment and development of an ecosystem that was lacking any inhabitants beforehand. Example would include melting glaciers, volcanic eruptions, or landslides. Secondary succession is the reestablishment of a broken or disturbed ecosystem where the soil was left in tact. An example would be areas that have been cleared of existing vegetation.
In primary succession, a rock is exposed, or created when lava cools. Wind, rain,