Soil
As dead plants, animals, and animal droppings decay into the ground and mix with rocks they make a rich, dark soil called humus. This soil is essential for plants and grasses to grow in grasslands.
Primary Succession
The last ice age has stripped the nutrients from the soil making it rocky. Then lichens grew on it, and after a while moss started to grow. Then there was grass.
Secondary Succession
The wildfires are important for the grassland it keeps it from becoming a forest. When there is a wildfire it burns the blade of the grass, but the root is still alive. After a while the grass starts to grow from the root.
The difference between a primary and secondary succession is that primary succession is the colonization of organisms into an area that was not previously colonized by any living thing
Secondary Succession is the regeneration of the living community after a major disturbance
