A tornado comes and destroys the land by ripping up all the grass and plants and kill all the animals
Afterwards, there's nothing left but soil and dirt.
Eventually some grass starts growing on the soil, and since this is secondary succession nothing is needed to break down bare rock and turn it into soil.
Then some tall grass starts growing along with some bushes, and the ecosystem is looking visibly better.
Then trees start growing, and small herbivores move in.
The trees reach there fullest height, and new predators move in, for example the tree-dog. At this point, our ecosystem is now called a climax community