Q: Janelle is walking on the sidewalk when she comes to a section that has a crack in it with grass growing up through. What type of succession is this, and how can Janelle be sure?

Janelle is walking on the sidewalk when she comes to a section that has a crack in it with grass growing up through. What type of succession is this, and how can Janelle be sure?

Flexi Says: Primary succession is the type of ecological succession that happens on new lands—lands where life has not yet existed. Primary succession can take place after lava flow cools and hardens into new land, or a glacier recedes exposing new land. Since the land that results from these processes is completely new land, soil must first be produced.